[K/N] FileCheck-based tests

Introduce a simple infrastructure for testing produced bitcode with
FileCheck LLVM utility.

^KT-48925

kotlin-native/backend.native/tests/filecheck/escape_analysis.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+class A(val x: Int)
+
+// CHECK-LABEL: "kfun:#main(){}"
+fun main() {
+    // CHECK-DEBUG: call %struct.ObjHeader* @AllocInstance
+    // CHECK-OPT: alloca %"kclassbody:A#internal"
+    val a = A(5)
+    println(a.x)
+// CHECK-LABEL: epilogue
+}

kotlin-native/backend.native/tests/filecheck/intrinsics.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// CHECK-LABEL: "kfun:#and(kotlin.Int;kotlin.Int){}kotlin.Int"
+fun and(a: Int, b: Int): Int {
+    // CHECK: and {{.*}}, {{.*}}
+    return a and b
+// CHECK-LABEL: epilogue
+}
+
+// CHECK-LABEL: "kfun:#ieee754(kotlin.Float;kotlin.Float){}kotlin.Boolean"
+fun ieee754(a: Float, b: Float): Boolean {
+    // CHECK: fcmp oeq float {{.*}}, {{.*}}
+    return a == b
+// CHECK-LABEL: epilogue
+}
+
+// CHECK-LABEL: "kfun:#main(){}"
+fun main() {
+    val x = and(1, 2)
+    val y = ieee754(0.0f, 1.0f)
+// CHECK-LABEL: epilogue
+}

kotlin-native/backend.native/tests/filecheck/replace_invoke_with_call.kt

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+fun flameThrower() {
+    throw Throwable("🔥")
+}
+
+// CHECK-LABEL: "kfun:#f1(){}"
+fun f1() {
+    // CHECK: call void @"kfun:#flameThrower(){}"()
+    flameThrower()
+// CHECK-LABEL: epilogue
+}
+
+// CHECK-LABEL: "kfun:#f2(){}"
+fun f2() {
+    try {
+        // CHECK: invoke void @"kfun:#flameThrower(){}"()
+        flameThrower()
+    } catch (t: Throwable) {}
+// CHECK-LABEL: epilogue
+}
+
+// CHECK-LABEL: "kfun:#main(){}"
+fun main() {
+    f1()
+    f2()
+// CHECK-LABEL: epilogue
+}

kotlin-native/backend.native/tests/filecheck/smoke0.kt

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+// CHECK-LABEL: "kfun:#id(kotlin.Any?){}kotlin.Any?"
+fun id(a: Any?): Any? {
+    return a
+// CHECK-LABEL: epilogue
+}
+
+// CHECK-LABEL: "kfun:#main(){}"
+fun main() {
+    // CHECK: invoke %struct.ObjHeader* @"kfun:#id(kotlin.Any?){}kotlin.Any?"
+    val x = id("Hello")
+    // CHECK: invoke void @"kfun:kotlin.io#println(kotlin.Any?){}"(%struct.ObjHeader* {{.*}})
+    println(x)
+// CHECK-LABEL: epilogue
+}