Revert of [regexp] Add stub for RegExpExec instead of inlining

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index ecaf5fa819af2bb572c497dc19cdc41b769425b1..2590fd27c6a79c1fc4cf6c58524523e0db201f09 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -52,7 +52,6 @@
   V(ConstructStub)                        \
   V(ConstructTrampoline)                  \
   V(RegExpExec)                           \
-  V(RegExpExecInternal)                   \
   V(RegExpReplace)                        \
   V(RegExpSplit)                          \
   V(CopyFastSmiOrObjectElements)          \
@@ -658,13 +657,6 @@
                                      CallInterfaceDescriptor)
 };
 
-class RegExpExecInternalDescriptor : public CallInterfaceDescriptor {
- public:
-  DEFINE_PARAMETERS(kReceiver, kString)
-  DECLARE_DEFAULT_DESCRIPTOR(RegExpExecInternalDescriptor,
-                             CallInterfaceDescriptor, kParameterCount)
-};
-
 class RegExpReplaceDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kReceiver, kString, kReplaceValue)