PPC/s390: [es2015] Simplify contract between parser and stub for derived constructors.

Port 776d89f9

Original Commit Message:

    Rewrite returns in derived constructors to only replace undefined with
    this, and otherwise just return the value, and let the construct stub
    builtin throw an exception if the result is a primitive instead of a
    JSReceiver.

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=chromium:706642
LOG=N

Review-Url: https://codereview.chromium.org/2786413003
Cr-Commit-Position: refs/heads/master@{#44315}

src/builtins/ppc/builtins-ppc.cc

@@ -588,8 +588,12 @@ void Generate_JSConstructStubHelper(MacroAssembler* masm, bool is_api_function,
   // Check that the result is not a Smi, indicating that the constructor result
   // from a derived class is neither undefined nor an Object.
   if (check_derived_construct) {
-    Label dont_throw;
-    __ JumpIfNotSmi(r3, &dont_throw);
+    Label do_throw, dont_throw;
+    __ JumpIfSmi(r3, &do_throw);
+    STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
+    __ CompareObjectType(r3, r6, r6, FIRST_JS_RECEIVER_TYPE);
+    __ bge(&dont_throw);
+    __ bind(&do_throw);
     {
       FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
       __ CallRuntime(Runtime::kThrowDerivedConstructorReturnedNonObject);

src/builtins/s390/builtins-s390.cc

@@ -585,8 +585,12 @@ void Generate_JSConstructStubHelper(MacroAssembler* masm, bool is_api_function,
   // Check that the result is not a Smi, indicating that the constructor result
   // from a derived class is neither undefined nor an Object.
   if (check_derived_construct) {
-    Label dont_throw;
-    __ JumpIfNotSmi(r2, &dont_throw);
+    Label do_throw, dont_throw;
+    __ JumpIfSmi(r2, &do_throw);
+    STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
+    __ CompareObjectType(r2, r5, r5, FIRST_JS_RECEIVER_TYPE);
+    __ bge(&dont_throw);
+    __ bind(&do_throw);
     {
       FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
       __ CallRuntime(Runtime::kThrowDerivedConstructorReturnedNonObject);