[runtime] [proxy] removing JSFunctionProxy and related code.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 81c6ed4281b91588f6592b365ac7652e77ce3d78..11351022eab436cdad37d69df46325067838d6bb 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -12316,10 +12316,7 @@ void HOptimizedGraphBuilder::GenerateIsJSProxy(CallRuntime* call) {
   HValue* instance_type =
       Add<HLoadNamedField>(map, nullptr, HObjectAccess::ForMapInstanceType());
   if_proxy.If<HCompareNumericAndBranch>(
-      instance_type, Add<HConstant>(FIRST_JS_PROXY_TYPE), Token::GTE);
-  if_proxy.And();
-  if_proxy.If<HCompareNumericAndBranch>(
-      instance_type, Add<HConstant>(LAST_JS_PROXY_TYPE), Token::LTE);
+      instance_type, Add<HConstant>(JS_PROXY_TYPE), Token::EQ);
 
   if_proxy.CaptureContinuation(&continuation);
   return ast_context()->ReturnContinuation(&continuation, call->id());