Get rid of the different kinds of yield in the AST & full-codegen.

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 25f18e571d369f10f599aad8a6bad1a2e5889ad4..d6a34560a12a8437b8e8b478d40e85055aef1388 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -1812,64 +1812,44 @@ void FullCodeGenerator::VisitYield(Yield* expr) {
   // this.  It stays on the stack while we update the iterator.
   VisitForStackValue(expr->expression());
 
-  switch (expr->yield_kind()) {
-    case Yield::kSuspend:
-      // Pop value from top-of-stack slot; box result into result register.
-      EmitCreateIteratorResult(false);
-      PushOperand(result_register());
-    // Fall through.
-    case Yield::kInitial: {
-      Label suspend, continuation, post_runtime, resume;
-
-      __ b(&suspend);
-      __ bind(&continuation);
-      // When we arrive here, the stack top is the resume mode and
-      // result_register() holds the input value (the argument given to the
-      // respective resume operation).
-      __ RecordGeneratorContinuation();
-      __ pop(r4);
-      __ CmpSmiLiteral(r4, Smi::FromInt(JSGeneratorObject::RETURN), r0);
-      __ bne(&resume);
-      __ push(result_register());
-      EmitCreateIteratorResult(true);
-      EmitUnwindAndReturn();
-
-      __ bind(&suspend);
-      OperandStackDepthIncrement(1);  // Not popped on this path.
-      VisitForAccumulatorValue(expr->generator_object());
-      DCHECK(continuation.pos() > 0 && Smi::IsValid(continuation.pos()));
-      __ LoadSmiLiteral(r4, Smi::FromInt(continuation.pos()));
-      __ StoreP(r4, FieldMemOperand(r3, JSGeneratorObject::kContinuationOffset),
-                r0);
-      __ StoreP(cp, FieldMemOperand(r3, JSGeneratorObject::kContextOffset), r0);
-      __ mr(r4, cp);
-      __ RecordWriteField(r3, JSGeneratorObject::kContextOffset, r4, r5,
-                          kLRHasBeenSaved, kDontSaveFPRegs);
-      __ addi(r4, fp, Operand(StandardFrameConstants::kExpressionsOffset));
-      __ cmp(sp, r4);
-      __ beq(&post_runtime);
-      __ push(r3);  // generator object
-      __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 1);
-      __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
-      __ bind(&post_runtime);
-      PopOperand(result_register());
-      EmitReturnSequence();
-
-      __ bind(&resume);
-      context()->Plug(result_register());
-      break;
-    }
-
-    case Yield::kFinal: {
-      // Pop value from top-of-stack slot, box result into result register.
-      EmitCreateIteratorResult(true);
-      EmitUnwindAndReturn();
-      break;
-    }
+  Label suspend, continuation, post_runtime, resume;
+
+  __ b(&suspend);
+  __ bind(&continuation);
+  // When we arrive here, the stack top is the resume mode and
+  // result_register() holds the input value (the argument given to the
+  // respective resume operation).
+  __ RecordGeneratorContinuation();
+  __ pop(r4);
+  __ CmpSmiLiteral(r4, Smi::FromInt(JSGeneratorObject::RETURN), r0);
+  __ bne(&resume);
+  __ push(result_register());
+  EmitCreateIteratorResult(true);
+  EmitUnwindAndReturn();
+
+  __ bind(&suspend);
+  OperandStackDepthIncrement(1);  // Not popped on this path.
+  VisitForAccumulatorValue(expr->generator_object());
+  DCHECK(continuation.pos() > 0 && Smi::IsValid(continuation.pos()));
+  __ LoadSmiLiteral(r4, Smi::FromInt(continuation.pos()));
+  __ StoreP(r4, FieldMemOperand(r3, JSGeneratorObject::kContinuationOffset),
+            r0);
+  __ StoreP(cp, FieldMemOperand(r3, JSGeneratorObject::kContextOffset), r0);
+  __ mr(r4, cp);
+  __ RecordWriteField(r3, JSGeneratorObject::kContextOffset, r4, r5,
+                      kLRHasBeenSaved, kDontSaveFPRegs);
+  __ addi(r4, fp, Operand(StandardFrameConstants::kExpressionsOffset));
+  __ cmp(sp, r4);
+  __ beq(&post_runtime);
+  __ push(r3);  // generator object
+  __ CallRuntime(Runtime::kSuspendJSGeneratorObject, 1);
+  __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
+  __ bind(&post_runtime);
+  PopOperand(result_register());
+  EmitReturnSequence();
 
-    case Yield::kDelegating:
-      UNREACHABLE();
-  }
+  __ bind(&resume);
+  context()->Plug(result_register());
 }