PPC: Remove separate construct stub for new.target users.

Port e50c861b

R=mstarzinger@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1230973006

Cr-Commit-Position: refs/heads/master@{#29583}

src/ppc/builtins-ppc.cc

@@ -319,7 +319,7 @@ static void Generate_Runtime_NewObject(MacroAssembler* masm,
 
   if (create_memento) {
     // Get the cell or allocation site.
-    __ LoadP(r5, MemOperand(sp, 2 * kPointerSize));
+    __ LoadP(r5, MemOperand(sp, 3 * kPointerSize));
     __ Push(r5, r4, original_constructor);
     __ CallRuntime(Runtime::kNewObjectWithAllocationSite, 3);
     __ mr(result, r3);
@@ -337,7 +337,6 @@ static void Generate_Runtime_NewObject(MacroAssembler* masm,
 
 static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                                            bool is_api_function,
-                                           bool use_new_target,
                                            bool create_memento) {
   // ----------- S t a t e -------------
   //  -- r3     : number of arguments
@@ -364,11 +363,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
 
     // Preserve the incoming parameters on the stack.
     __ SmiTag(r3);
-    if (use_new_target) {
-      __ Push(r3, r4, r6);
-    } else {
-      __ Push(r3, r4);
-    }
+    __ Push(r3, r4, r6);
 
     Label rt_call, allocated, normal_new, count_incremented;
     __ cmp(r4, r6);
@@ -616,8 +611,7 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     __ bind(&allocated);
 
     if (create_memento) {
-      int offset = (use_new_target ? 3 : 2) * kPointerSize;
-      __ LoadP(r5, MemOperand(sp, offset));
+      __ LoadP(r5, MemOperand(sp, 3 * kPointerSize));
       __ LoadRoot(r8, Heap::kUndefinedValueRootIndex);
       __ cmp(r5, r8);
       __ beq(&count_incremented);
@@ -633,22 +627,14 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     }
 
     // Restore the parameters.
-    if (use_new_target) {
-      __ Pop(r4, ip);
-    } else {
-      __ pop(r4);
-    }
+    __ Pop(r4, ip);
 
     // Retrieve smi-tagged arguments count from the stack.
     __ LoadP(r6, MemOperand(sp));
 
     // Push new.target onto the construct frame. This is stored just below the
     // receiver on the stack.
-    if (use_new_target) {
-      __ Push(ip, r7, r7);
-    } else {
-      __ Push(r7, r7);
-    }
+    __ Push(ip, r7, r7);
 
     // Set up pointer to last argument.
     __ addi(r5, fp, Operand(StandardFrameConstants::kCallerSPOffset));
@@ -659,8 +645,8 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // r6: number of arguments (smi-tagged)
     // sp[0]: receiver
     // sp[1]: receiver
-    // sp[2]: new.target (if used)
-    // sp[2/3]: number of arguments (smi-tagged)
+    // sp[2]: new.target
+    // sp[3]: number of arguments (smi-tagged)
     Label loop, no_args;
     __ SmiUntag(r3, r6, SetRC);
     __ beq(&no_args, cr0);
@@ -687,17 +673,15 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     }
 
     // Store offset of return address for deoptimizer.
-    // TODO(arv): Remove the "!use_new_target" before supporting optimization
-    // of functions that reference new.target
-    if (!is_api_function && !use_new_target) {
+    if (!is_api_function) {
       masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset());
     }
 
     // Restore context from the frame.
     // r3: result
     // sp[0]: receiver
-    // sp[1]: new.target (if used)
-    // sp[1/2]: number of arguments (smi-tagged)
+    // sp[1]: new.target
+    // sp[2]: number of arguments (smi-tagged)
     __ LoadP(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 
     // If the result is an object (in the ECMA sense), we should get rid
@@ -708,8 +692,8 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // If the result is a smi, it is *not* an object in the ECMA sense.
     // r3: result
     // sp[0]: receiver (newly allocated object)
-    // sp[1]: new.target (if used)
-    // sp[1/2]: number of arguments (smi-tagged)
+    // sp[1]: new.target
+    // sp[2]: number of arguments (smi-tagged)
     __ JumpIfSmi(r3, &use_receiver);
 
     // If the type of the result (stored in its map) is less than
@@ -727,10 +711,9 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     __ bind(&exit);
     // r3: result
     // sp[0]: receiver (newly allocated object)
-    // sp[1]: new.target (if used)
-    // sp[1/2]: number of arguments (smi-tagged)
-    int offset = (use_new_target ? 2 : 1) * kPointerSize;
-    __ LoadP(r4, MemOperand(sp, offset));
+    // sp[1]: new.target (original constructor)
+    // sp[2]: number of arguments (smi-tagged)
+    __ LoadP(r4, MemOperand(sp, 2 * kPointerSize));
 
     // Leave construct frame.
   }
@@ -744,17 +727,12 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
 
 
 void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, false, false, FLAG_pretenuring_call_new);
+  Generate_JSConstructStubHelper(masm, false, FLAG_pretenuring_call_new);
 }
 
 
 void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, true, false, false);
-}
-
-
-void Builtins::Generate_JSConstructStubNewTarget(MacroAssembler* masm) {
-  Generate_JSConstructStubHelper(masm, false, true, FLAG_pretenuring_call_new);
+  Generate_JSConstructStubHelper(masm, true, false);
 }