Remove BLACKLIST from check-name-clashes.py, it's wrong nowadays.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 99196da425442eefd18fb735e54a97f554848e22..e5836fd33e1031b7b56df60fcacc476de35e5658 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -1096,7 +1096,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
   // time or if regexp entry in generated code is turned off runtime switch or
   // at compilation.
 #ifdef V8_INTERPRETED_REGEXP
-  __ TailCallRuntime(Runtime::kRegExpExecRT, 4, 1);
+  __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
 #else  // V8_INTERPRETED_REGEXP
 
   // Stack frame on entry.
@@ -1484,7 +1484,7 @@ void RegExpExecStub::Generate(MacroAssembler* masm) {
 
   // Do the runtime call to execute the regexp.
   __ bind(&runtime);
-  __ TailCallRuntime(Runtime::kRegExpExecRT, 4, 1);
+  __ TailCallRuntime(Runtime::kRegExpExec, 4, 1);
 
   // Deferred code for string handling.
   // (7) Not a long external string?  If yes, go to (10).