[JVM_IR] Support suspend functions that can be overriden.

The challenge for overridable suspend functions is that the calling
the state machine method to resume after suspension would be
virtually dispatced to the wrong method. To avoid that a static
suspend implementation method is generated which becomes the
state machine method used to resume.

compiler/testData/codegen/box/coroutines/suspendCovariantJavaOverrides.kt

@@ -1,5 +1,4 @@
 // TARGET_BACKEND: JVM
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 

compiler/testData/codegen/box/coroutines/suspendFunctionAsCoroutine/openFunWithJava.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // FILE: main.kt

compiler/testData/codegen/box/coroutines/suspendFunctionAsCoroutine/superCall.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST

compiler/testData/codegen/box/coroutines/suspendFunctionAsCoroutine/superCallAbstractClass.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // WITH_RUNTIME
 // WITH_COROUTINES
 // COMMON_COROUTINES_TEST