[contexts] Place the initial JSArray maps on the native context directly.

src/mips64/macro-assembler-mips64.cc

Index: src/mips64/macro-assembler-mips64.cc
diff --git a/src/mips64/macro-assembler-mips64.cc b/src/mips64/macro-assembler-mips64.cc
index 7096ba61e367cab3ae5196d59717d4ffa201cb55..66d6a7912a4f6249616fee17c1e061852a9bcb5f 100644
--- a/src/mips64/macro-assembler-mips64.cc
+++ b/src/mips64/macro-assembler-mips64.cc
@@ -5057,16 +5057,17 @@ void MacroAssembler::LoadTransitionedArrayMapConditional(
     Register map_in_out,
     Register scratch,
     Label* no_map_match) {
+  DCHECK(IsFastElementsKind(expected_kind));
+  DCHECK(IsFastElementsKind(transitioned_kind));
+
   // Check that the function's map is the same as the expected cached map.
-  LoadNativeContextSlot(Context::JS_ARRAY_MAPS_INDEX, scratch);
-  int offset = expected_kind * kPointerSize + FixedArrayBase::kHeaderSize;
-  ld(at, FieldMemOperand(scratch, offset));
+  ld(scratch, NativeContextMemOperand());
+  ld(at, ContextMemOperand(scratch, Context::ArrayMapIndex(expected_kind)));
   Branch(no_map_match, ne, map_in_out, Operand(at));
 
   // Use the transitioned cached map.
-  offset = transitioned_kind * kPointerSize +
-      FixedArrayBase::kHeaderSize;
-  ld(map_in_out, FieldMemOperand(scratch, offset));
+  ld(map_in_out,
+     ContextMemOperand(scratch, Context::ArrayMapIndex(transitioned_kind)));
 }