Fix some of the bytecodeText tests

The changes are necessary because of release coroutines support:
- Get rid of suspendCoroutineOrReturn calls. It's anyway irrelevant
to what is being tested here

- In varValueConflictsWithTable.kt, variables slots have been shifted
because the variable for continuation's exception was removed

- In varValueConflictsWithTableSameSort.kt, a variable has been introduced
to preserve the same slot numbers for old variables.
Otherwise, they become shifted and to the second slot,
and there are a lot of irrelevant "ALOAD 2" instructions

This change is another example of why bytecode text tests are evil

compiler/testData/codegen/bytecodeText/constCoroutine.kt

@@ -24,5 +24,4 @@ fun box(): String {
 
 // 2 GETSTATIC kotlin/Unit.INSTANCE
 // 1 GETSTATIC helpers/EmptyContinuation.Companion
-// 4 GETSTATIC kotlin\/coroutines\/experimental\/EmptyCoroutineContext.INSTANCE
-// 7 GETSTATIC
+// 3 GETSTATIC