[runtime] Introduce a proper %NewArray runtime entry.

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
diff --git a/src/mips/code-stubs-mips.cc b/src/mips/code-stubs-mips.cc
index d9bbb1a76b4b1c3deca007265bc7c42fe33a07aa..72eebe7151057d04117bd7e1b86d61510fd8ddc7 100644
--- a/src/mips/code-stubs-mips.cc
+++ b/src/mips/code-stubs-mips.cc
@@ -5030,26 +5030,26 @@ void ArrayConstructorStub::Generate(MacroAssembler* masm) {
 
   // Subclassing.
   __ bind(&subclassing);
-  __ Push(a1);
-  __ Push(a3);
-
-  // Adjust argc.
   switch (argument_count()) {
     case ANY:
     case MORE_THAN_ONE:
-      __ li(at, Operand(2));
+      __ sll(at, a0, kPointerSizeLog2);
+      __ addu(at, sp, at);
+      __ sw(a1, MemOperand(at));
+      __ li(at, Operand(3));
       __ addu(a0, a0, at);
       break;
     case NONE:
-      __ li(a0, Operand(2));
+      __ sw(a1, MemOperand(sp, 0 * kPointerSize));
+      __ li(a0, Operand(3));
       break;
     case ONE:
-      __ li(a0, Operand(3));
+      __ sw(a1, MemOperand(sp, 1 * kPointerSize));
+      __ li(a0, Operand(4));
       break;
   }
-
-  __ JumpToExternalReference(
-      ExternalReference(Runtime::kArrayConstructorWithSubclassing, isolate()));
+  __ Push(a3, a2);
+  __ JumpToExternalReference(ExternalReference(Runtime::kNewArray, isolate()));
 }