Make code generation in method transformer more stable

Do not mix references to label nodes and common ASM labels
as it may lead to different LabelNode instance (not defaultLabel)
being inserted into insns list

It's been working before because there was no `resetLabels` call
on insnList, and label/label nodes were bound to each other

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/CoroutineTransformerMethodVisitor.kt

@@ -125,9 +125,9 @@ class CoroutineTransformerMethodVisitor(
             )
 
             insert(startLabel, withInstructionAdapter { generateResumeWithExceptionCheck(exceptionIndex) })
+            insert(last, defaultLabel)
 
             insert(last, withInstructionAdapter {
-                visitLabel(defaultLabel.label)
                 AsmUtil.genThrow(this, "java/lang/IllegalStateException", "call to 'resume' before 'invoke' with coroutine")
                 areturn(Type.VOID_TYPE)
             })