Revert of [regexp] Remove remainder of native RegExpExecStub

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index bfacf6c62cc5682df71cf992129185ff62a81d80..b3269eade1c9531a59f5c43f8ca4bb4670ce7fb2 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -45,6 +45,7 @@
   V(MathPow)                                  \
   V(ProfileEntryHook)                         \
   V(RecordWrite)                              \
+  V(RegExpExec)                               \
   V(StoreBufferOverflow)                      \
   V(StoreSlowElement)                         \
   V(SubString)                                \
@@ -1135,6 +1136,15 @@
   DEFINE_PLATFORM_CODE_STUB(JSEntry, PlatformCodeStub);
 };
 
+
+class RegExpExecStub: public PlatformCodeStub {
+ public:
+  explicit RegExpExecStub(Isolate* isolate) : PlatformCodeStub(isolate) { }
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(RegExpExec);
+  DEFINE_PLATFORM_CODE_STUB(RegExpExec, PlatformCodeStub);
+};
+
 // TODO(bmeurer/mvstanton): Turn CallConstructStub into ConstructICStub.
 class CallConstructStub final : public PlatformCodeStub {
  public: