Switch CallConstructStub to take new.target in register.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 90a72ada64bb785e5f433e0ce9a82d608ceef496..68737b00c507fe8a5ce421ee530f00461dbb42fe 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -2780,16 +2780,23 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
   // a0 : number of arguments
   // a1 : the function to call
   // a2 : feedback vector
-  // a3 : (only if a2 is not undefined) slot in feedback vector (Smi)
+  // a3 : slot in feedback vector (Smi, for RecordCallTarget)
+  // a4 : original constructor (for IsSuperConstructorCall)
   Label slow, non_function_call;
   // Check that the function is not a smi.
   __ JumpIfSmi(a1, &non_function_call);
   // Check that the function is a JSFunction.
-  __ GetObjectType(a1, a4, a4);
-  __ Branch(&slow, ne, a4, Operand(JS_FUNCTION_TYPE));
+  __ GetObjectType(a1, a5, a5);
+  __ Branch(&slow, ne, a5, Operand(JS_FUNCTION_TYPE));
 
   if (RecordCallTarget()) {
+    if (IsSuperConstructorCall()) {
+      __ push(a4);
+    }
     GenerateRecordCallTarget(masm);
+    if (IsSuperConstructorCall()) {
+      __ pop(a4);
+    }
 
     __ dsrl(at, a3, 32 - kPointerSizeLog2);
     __ Daddu(a5, a2, at);
@@ -2814,11 +2821,7 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
 
   // Pass function as original constructor.
   if (IsSuperConstructorCall()) {
-    __ li(a4, Operand(1 * kPointerSize));
-    __ dsll(at, a0, kPointerSizeLog2);
-    __ daddu(a4, a4, at);
-    __ daddu(at, sp, a4);
-    __ ld(a3, MemOperand(at, 0));
+    __ mov(a3, a4);
   } else {
     __ mov(a3, a1);
   }
@@ -2833,10 +2836,10 @@ void CallConstructStub::Generate(MacroAssembler* masm) {
 
   // a0: number of arguments
   // a1: called object
-  // a4: object type
+  // a5: object type
   Label do_call;
   __ bind(&slow);
-  __ Branch(&non_function_call, ne, a4, Operand(JS_FUNCTION_PROXY_TYPE));
+  __ Branch(&non_function_call, ne, a5, Operand(JS_FUNCTION_PROXY_TYPE));
   __ GetBuiltinFunction(a1, Builtins::CALL_FUNCTION_PROXY_AS_CONSTRUCTOR);
   __ jmp(&do_call);