Support inline suspend functions

A lot of additional work was required to support them:
- Suspension points are being identified by two markers
  instead of one pointing to suspend function call
- Approach with replacing return type of suspend function does not work anymore.
  So we decode suspension return type as an argument for begin marker
- It became necessary to perform variables liveness analysis
  (see comment in org.jetbrains.kotlin.codegen.coroutines.CoroutineTransformerMethodVisitor.spillVariables)

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -4159,6 +4159,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             doTest(fileName);
         }
 
+        @TestMetadata("inlineSuspendFunction.kt")
+        public void testInlineSuspendFunction() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/inlineSuspendFunction.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("inlinedTryCatchFinally.kt")
         public void testInlinedTryCatchFinally() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/coroutines/inlinedTryCatchFinally.kt");