Fix verify error with 'return when/if/try' in suspend function

The problem appears for tail-optimized suspend functions,
we erroneously assumed that when/if/try expressions in tail-call
position have simple types like `I` while actually, they can return SUSPENDED
object, i.e. must have `java/lang/Object` as return type.

But this only concerns branching operations in tail-call position,
so we have to make an additional analysis for remembering whether
a given expression is in a tail-call position.

Also, it's important here that we now assume
the return type of the current function  as `java/lang/Object`
that is necessary to avoid wrong checkcasts.

 #KT-15364 Fixed

compiler/testData/codegen/box/coroutines/tailOperations/suspendWithIf.kt

@@ -0,0 +1,29 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+
+suspend fun foo(x: Any): Int {
+    return if (x == "56") suspendHere() else 13
+}
+
+suspend fun suspendHere(): Int = suspendCoroutineOrReturn { x ->
+    x.resume(56)
+    SUSPENDED_MARKER
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+fun box(): String {
+    var result = -1
+
+    builder {
+        result = foo("56")
+    }
+
+    if (result != 56) return "fail 1: $result"
+
+    return "OK"
+}

compiler/testData/codegen/box/coroutines/tailOperations/suspendWithTryCatch.kt

@@ -0,0 +1,33 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+
+suspend fun foo(x: Any): Int {
+    return try {
+        suspendHere()
+    } catch (e: Throwable) {
+        13
+    }
+}
+
+suspend fun suspendHere(): Int = suspendCoroutineOrReturn { x ->
+    x.resume(56)
+    SUSPENDED_MARKER
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+fun box(): String {
+    var result = -1
+
+    builder {
+        result = foo("56")
+    }
+
+    if (result != 56) return "fail 1: $result"
+
+    return "OK"
+}

compiler/testData/codegen/box/coroutines/tailOperations/suspendWithWhen.kt

@@ -0,0 +1,32 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+import kotlin.coroutines.*
+import kotlin.coroutines.intrinsics.*
+
+suspend fun foo(x: Any): Int {
+    return when {
+        x == "56" -> suspendHere()
+        else -> 13
+    }
+}
+
+suspend fun suspendHere(): Int = suspendCoroutineOrReturn { x ->
+    x.resume(56)
+    SUSPENDED_MARKER
+}
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+fun box(): String {
+    var result = -1
+
+    builder {
+        result = foo("56")
+    }
+
+    if (result != 56) return "fail 1: $result"
+
+    return "OK"
+}