[cleanup] Remove three unused proxy runtime functions

R=jgruber@chromium.org

Bug: v8:9183
Change-Id: I789295e5bbea682b2e46ccf5a55c69dc74f0ed72
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1617669
Auto-Submit: Simon Zünd <szuend@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61632}

src/debug/debug-evaluate.cc

@@ -252,7 +252,6 @@ bool IntrinsicHasNoSideEffect(Runtime::FunctionId id) {
   /* Type checks */                           \
   V(IsArray)                                  \
   V(IsFunction)                               \
-  V(IsJSProxy)                                \
   V(IsJSReceiver)                             \
   V(IsRegExp)                                 \
   V(IsSmi)                                    \

src/runtime/runtime-proxy.cc

@@ -16,30 +16,6 @@ namespace v8 {
 namespace internal {
 
 
-RUNTIME_FUNCTION(Runtime_IsJSProxy) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSProxy());
-}
-
-
-RUNTIME_FUNCTION(Runtime_JSProxyGetHandler) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
-  return proxy->handler();
-}
-
-
-RUNTIME_FUNCTION(Runtime_JSProxyGetTarget) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(JSProxy, proxy, 0);
-  return proxy->target();
-}
-
-
 RUNTIME_FUNCTION(Runtime_GetPropertyWithReceiver) {
   HandleScope scope(isolate);
 

src/runtime/runtime.h

@@ -359,9 +359,6 @@ namespace internal {
   F(CheckProxyGetSetTrapResult, 2, 1)  \
   F(CheckProxyHasTrapResult, 2, 1)     \
   F(GetPropertyWithReceiver, 3, 1)     \
-  F(IsJSProxy, 1, 1)                   \
-  F(JSProxyGetHandler, 1, 1)           \
-  F(JSProxyGetTarget, 1, 1)            \
   F(SetPropertyWithReceiver, 4, 1)
 
 #define FOR_EACH_INTRINSIC_REGEXP(F, I)             \