[WIP] Add Compiler Smoke Tests for (suspend) main methods

This commit ports the (parameterless) main integration tests in
`CompilerSmokeTest` to the IR backend. It also includes a simple
suspend main test.

The advanced ones (like `helloAppSuspendParameterlessMain`) are
currently blocked by pending changes to capturing suspend lambdas,
which are underway.

compiler/testData/integration/smoke/helloAppFQMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppFQMainIR/hello.kt

@@ -0,0 +1,6 @@
+package Hello
+
+fun main(args: kotlin.Array<kotlin.String>) {
+    args.size
+    System.out.println("Hello from fully qualified main!")
+}

compiler/testData/integration/smoke/helloAppFQMainIR/hello.run.expected

@@ -0,0 +1,4 @@
+OUT:
+Hello from fully qualified main!
+
+Return code: 0

compiler/testData/integration/smoke/helloAppIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppIR/hello.kt

@@ -0,0 +1,5 @@
+package Hello
+
+fun main() {
+    System.out.println("Hello!")
+}

compiler/testData/integration/smoke/helloAppIR/hello.run.expected

@@ -0,0 +1,4 @@
+OUT:
+Hello!
+
+Return code: 0

compiler/testData/integration/smoke/helloAppOldAndParameterlessMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppOldAndParameterlessMainIR/hello.kt

@@ -0,0 +1,10 @@
+package Hello
+
+fun main(args: Array<String>) {
+    args.size
+    System.out.println("Hello!")
+}
+
+fun main() {
+    System.out.println("Fail")
+}

compiler/testData/integration/smoke/helloAppOldAndParameterlessMainIR/hello.run.expected

@@ -0,0 +1,4 @@
+OUT:
+Hello!
+
+Return code: 0

compiler/testData/integration/smoke/helloAppParameterlessMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppParameterlessMainIR/hello.kt

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+package Hello
+
+fun main() {
+    System.out.println("Hello!")
+}

compiler/testData/integration/smoke/helloAppParameterlessMainIR/hello.run.expected

@@ -0,0 +1,4 @@
+OUT:
+Hello!
+
+Return code: 0

compiler/testData/integration/smoke/helloAppSuspendMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppSuspendMainIR/hello.kt

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+package Hello
+
+import kotlin.concurrent.thread
+import kotlin.coroutines.suspendCoroutine
+import kotlin.coroutines.resume
+
+@kotlin.jvm.Volatile
+private var result = ""
+@kotlin.jvm.Volatile
+private var callback: Function0<Unit>? = null
+
+suspend fun appendAndSuspend(s: String) {
+    result += s
+
+    suspendCoroutine<Unit> { continuation ->
+        callback = {
+            continuation.resume(Unit)
+        }
+    }
+}
+
+suspend fun main(args: Array<String>) {
+    thread(isDaemon = true) {
+        while (true) {
+            val c = callback
+            c?.invoke()
+            Thread.sleep(500)
+        }
+    }
+
+    appendAndSuspend(args[0])
+    appendAndSuspend(args[1])
+    println(result)
+    callback = null
+}

compiler/testData/integration/smoke/helloAppSuspendMainIR/hello.run.expected

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+OUT:
+OK
+
+Return code: 0

compiler/testData/integration/smoke/helloAppSuspendMainInMultifileIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppSuspendMainInMultifileIR/hello.kt

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+@file:JvmMultifileClass
+@file:JvmName("Foo")
+package Hello
+
+import kotlin.concurrent.thread
+import kotlin.coroutines.suspendCoroutine
+import kotlin.coroutines.resume
+
+@kotlin.jvm.Volatile
+private var result = ""
+@kotlin.jvm.Volatile
+private var callback: Function0<Unit>? = null
+
+suspend fun appendAndSuspend(s: String) {
+    result += s
+
+    suspendCoroutine<Unit> { continuation ->
+        callback = {
+            continuation.resume(Unit)
+        }
+    }
+}
+
+suspend fun main(args: Array<String>) {
+    thread(isDaemon = true) {
+        while (true) {
+            val c = callback
+            c?.invoke()
+            Thread.sleep(500)
+        }
+    }
+
+    appendAndSuspend(args[0])
+    appendAndSuspend(args[1])
+    println(result)
+    callback = null
+}

compiler/testData/integration/smoke/helloAppSuspendMainInMultifileIR/hello.run.expected

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+OUT:
+OK
+
+Return code: 0

compiler/testData/integration/smoke/helloAppSuspendParameterlessMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppSuspendParameterlessMainIR/hello.kt

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+package Hello
+
+import kotlin.concurrent.thread
+import kotlin.coroutines.suspendCoroutine
+import kotlin.coroutines.resume
+import kotlin.reflect.jvm.javaMethod
+
+@kotlin.jvm.Volatile
+private var result = ""
+@kotlin.jvm.Volatile
+private var callback: Function0<Unit>? = null
+
+suspend fun appendAndSuspend(s: String) {
+    result += s
+
+    suspendCoroutine<Unit> { continuation ->
+        callback = {
+            continuation.resume(Unit)
+        }
+    }
+}
+
+suspend fun main() {
+    thread(isDaemon = true) {
+        while (true) {
+            val c = callback
+            c?.invoke()
+            Thread.sleep(500)
+        }
+    }
+
+    appendAndSuspend("O")
+    appendAndSuspend("K")
+    println(result)
+    callback = null
+}

compiler/testData/integration/smoke/helloAppSuspendParameterlessMainIR/hello.run.expected

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+OUT:
+OK
+
+Return code: 0

compiler/testData/integration/smoke/helloAppVarargMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/helloAppVarargMainIR/hello.kt

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+package Hello
+
+fun main(vararg args: kotlin.String) {
+    args.size
+    System.out.println("Hello from vararg main!")
+}

compiler/testData/integration/smoke/helloAppVarargMainIR/hello.run.expected

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+OUT:
+Hello from vararg main!
+
+Return code: 0

compiler/testData/integration/smoke/simplestSuspendMainIR/hello.compile.expected

@@ -0,0 +1 @@
+Return code: 0

compiler/testData/integration/smoke/simplestSuspendMainIR/hello.kt

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+package Hello
+
+suspend fun f(o: String, k: String): String {
+    return o + k
+}
+
+suspend fun main(args: Array<String>) {
+    val result = f(args[0], args[1])
+    println(result)
+}

compiler/testData/integration/smoke/simplestSuspendMainIR/hello.run.expected

@@ -0,0 +1,4 @@
+OUT:
+OK
+
+Return code: 0