Remove regexp caching.

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index 72a8037970116a92ca6f43a7197bd7b34199e016..ccdf2d31140975ef7cc9ec067ed4a6f97f136fc3 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -162,7 +162,6 @@ namespace internal {
   F(RegExpExecMultiple, 4, 1) \
   F(RegExpInitializeObject, 5, 1) \
   F(RegExpConstructResult, 3, 1) \
-  F(RegExpCloneResult, 1, 1) \
   \
   /* JSON */ \
   F(ParseJson, 1, 1) \
@@ -426,7 +425,7 @@ namespace internal {
 // ----------------------------------------------------------------------------
 // INLINE_AND_RUNTIME_FUNCTION_LIST defines all inlined functions accessed
 // with a native call of the form %_name from within JS code that also have
-  // a corresponding runtime function, that is called for slow cases.
+// a corresponding runtime function, that is called for slow cases.
 // Entries have the form F(name, number of arguments, number of return values).
 #define INLINE_RUNTIME_FUNCTION_LIST(F) \
   F(IsConstructCall, 0, 1)                                                   \
@@ -438,7 +437,6 @@ namespace internal {
   F(StringCompare, 2, 1)                                                     \
   F(RegExpExec, 4, 1)                                                        \
   F(RegExpConstructResult, 3, 1)                                             \
-  F(RegExpCloneResult, 1, 1)                                                 \
   F(GetFromCache, 2, 1)                                                      \
   F(NumberToString, 1, 1)                                                    \
   F(SwapElements, 3, 1)