MIPS: Implement inline %_IsJSProxy() for full codegen and Hydrogen.

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index 82ce5e23e8569bc933fbc581ad69da0fc62f7b87..6f7166b97dde8a46244be4209328aa6f0218a0a7 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -3417,6 +3417,32 @@ 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(v0, if_false);
+  Register map = a1;
+  Register type_reg = a2;
+  __ GetObjectType(v0, map, type_reg);
+  __ Subu(type_reg, type_reg, Operand(FIRST_JS_PROXY_TYPE));
+  PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
+  Split(ls, type_reg, Operand(LAST_JS_PROXY_TYPE - FIRST_JS_PROXY_TYPE),
+        if_true, if_false, fall_through);
+
+  context()->Plug(if_true, if_false);
+}
+
+
 void FullCodeGenerator::EmitIsConstructCall(CallRuntime* expr) {
   DCHECK(expr->arguments()->length() == 0);