Implement inline %_IsJSProxy() for full codegen and Hydrogen

src/arm64/full-codegen-arm64.cc

Index: src/arm64/full-codegen-arm64.cc
diff --git a/src/arm64/full-codegen-arm64.cc b/src/arm64/full-codegen-arm64.cc
index 5911e696562cea89d65e2faa47e42a06618c8720..81ccf2a031cd5b2c753a6efc744c0600abbb3501 100644
--- a/src/arm64/full-codegen-arm64.cc
+++ b/src/arm64/full-codegen-arm64.cc
@@ -3117,6 +3117,32 @@ void FullCodeGenerator::EmitIsRegExp(CallRuntime* expr) {
 }
 
 
+void FullCodeGenerator::EmitIsJSProxy(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK(args->length() == 1);
+
+  VisitForAccumulatorValue(args->at(0));
+
+  Label materialize_true, materialize_false;
+  Label* if_true = NULL;
+  Label* if_false = NULL;
+  Label* fall_through = NULL;
+  context()->PrepareTest(&materialize_true, &materialize_false, &if_true,
+                         &if_false, &fall_through);
+
+  __ JumpIfSmi(x0, if_false);
+  Register map = x10;
+  Register type_reg = x11;
+  __ Ldr(map, FieldMemOperand(x0, HeapObject::kMapOffset));
+  __ Ldrb(type_reg, FieldMemOperand(map, Map::kInstanceTypeOffset));
+  __ Sub(type_reg, type_reg, Operand(FIRST_JS_PROXY_TYPE));
+  __ Cmp(type_reg, Operand(LAST_JS_PROXY_TYPE - FIRST_JS_PROXY_TYPE));
+  PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
+  Split(ls, if_true, if_false, fall_through);
+
+  context()->Plug(if_true, if_false);
+}
+
 
 void FullCodeGenerator::EmitIsConstructCall(CallRuntime* expr) {
   DCHECK(expr->arguments()->length() == 0);