Simplify stackframe of construct stub on ARM and MIPS.

src/mips/builtins-mips.cc

Index: src/mips/builtins-mips.cc
diff --git a/src/mips/builtins-mips.cc b/src/mips/builtins-mips.cc
index d122e9a9f90854c9d6ea0a6d1b727af3304a4bd4..e8de833f939cd3560f84f4fa380b033bbf42dc8c 100644
--- a/src/mips/builtins-mips.cc
+++ b/src/mips/builtins-mips.cc
@@ -924,22 +924,15 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // t4: JSObject
     __ bind(&allocated);
     __ push(t4);
-
-    // Push the function and the allocated receiver from the stack.
-    // sp[0]: receiver (newly allocated object)
-    // sp[1]: constructor function
-    // sp[2]: number of arguments (smi-tagged)
-    __ lw(a1, MemOperand(sp, kPointerSize));
-    __ MultiPushReversed(a1.bit() | t4.bit());
+    __ push(t4);
 
     // Reload the number of arguments from the stack.
-    // a1: constructor function
     // sp[0]: receiver
-    // sp[1]: constructor function
-    // sp[2]: receiver
-    // sp[3]: constructor function
-    // sp[4]: number of arguments (smi-tagged)
-    __ lw(a3, MemOperand(sp, 4 * kPointerSize));
+    // sp[1]: receiver
+    // sp[2]: constructor function
+    // sp[3]: number of arguments (smi-tagged)
+    __ lw(a1, MemOperand(sp, 2 * kPointerSize));
+    __ lw(a3, MemOperand(sp, 3 * kPointerSize));
 
     // Set up pointer to last argument.
     __ Addu(a2, fp, Operand(StandardFrameConstants::kCallerSPOffset));
@@ -953,10 +946,9 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
     // a2: address of last argument (caller sp)
     // a3: number of arguments (smi-tagged)
     // sp[0]: receiver
-    // sp[1]: constructor function
-    // sp[2]: receiver
-    // sp[3]: constructor function
-    // sp[4]: number of arguments (smi-tagged)
+    // sp[1]: receiver
+    // sp[2]: constructor function
+    // sp[3]: number of arguments (smi-tagged)
     Label loop, entry;
     __ jmp(&entry);
     __ bind(&loop);
@@ -984,14 +976,6 @@ static void Generate_JSConstructStubHelper(MacroAssembler* masm,
                         NullCallWrapper(), CALL_AS_METHOD);
     }
 
-    // Pop the function from the stack.
-    // v0: result
-    // sp[0]: constructor function
-    // sp[2]: receiver
-    // sp[3]: constructor function
-    // sp[4]: number of arguments (smi-tagged)
-    __ Pop();
-
     // Restore context from the frame.
     __ lw(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));