[MIPS] Fix Apply builtin always taking the slow path.

src/builtins/mips/builtins-mips.cc

Index: src/builtins/mips/builtins-mips.cc
diff --git a/src/builtins/mips/builtins-mips.cc b/src/builtins/mips/builtins-mips.cc
index bdc2135c694a497fbdceff2842a071c5fe230b77..3364e388ab0d1738a4f238d4627fcf9be327b98d 100644
--- a/src/builtins/mips/builtins-mips.cc
+++ b/src/builtins/mips/builtins-mips.cc
@@ -2144,8 +2144,7 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
     __ Branch(&create_arguments, eq, a2, Operand(at));
 
     // Check if argumentsList is a fast JSArray.
-    __ lw(v0, FieldMemOperand(a2, HeapObject::kMapOffset));
-    __ lbu(v0, FieldMemOperand(v0, Map::kInstanceTypeOffset));
+    __ lbu(v0, FieldMemOperand(a2, Map::kInstanceTypeOffset));
     __ Branch(&create_array, eq, v0, Operand(JS_ARRAY_TYPE));
 
     // Ask the runtime to create the list (actually a FixedArray).
@@ -2188,15 +2187,15 @@ void Builtins::Generate_Apply(MacroAssembler* masm) {
 
     // Try to create the list from a JSArray object.
     __ bind(&create_array);
-    __ lw(a2, FieldMemOperand(a2, Map::kBitField2Offset));
-    __ DecodeField<Map::ElementsKindBits>(a2);
+    __ lbu(t1, FieldMemOperand(a2, Map::kBitField2Offset));
+    __ DecodeField<Map::ElementsKindBits>(t1);
     STATIC_ASSERT(FAST_SMI_ELEMENTS == 0);
     STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == 1);
     STATIC_ASSERT(FAST_ELEMENTS == 2);
     STATIC_ASSERT(FAST_HOLEY_ELEMENTS == 3);
-    __ Branch(&create_holey_array, eq, a2, Operand(FAST_HOLEY_SMI_ELEMENTS));
-    __ Branch(&create_holey_array, eq, a2, Operand(FAST_HOLEY_ELEMENTS));
-    __ Branch(&create_runtime, hi, a2, Operand(FAST_ELEMENTS));
+    __ Branch(&create_holey_array, eq, t1, Operand(FAST_HOLEY_SMI_ELEMENTS));
+    __ Branch(&create_holey_array, eq, t1, Operand(FAST_HOLEY_ELEMENTS));
+    __ Branch(&create_runtime, hi, t1, Operand(FAST_ELEMENTS));
     __ lw(a2, FieldMemOperand(a0, JSArray::kLengthOffset));
     __ lw(a0, FieldMemOperand(a0, JSArray::kElementsOffset));
     __ SmiUntag(a2);