[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 2590fd27c6a79c1fc4cf6c58524523e0db201f09..ecaf5fa819af2bb572c497dc19cdc41b769425b1 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -52,6 +52,7 @@ class PlatformInterfaceDescriptor;
   V(ConstructStub)                        \
   V(ConstructTrampoline)                  \
   V(RegExpExec)                           \
+  V(RegExpExecInternal)                   \
   V(RegExpReplace)                        \
   V(RegExpSplit)                          \
   V(CopyFastSmiOrObjectElements)          \
@@ -657,6 +658,13 @@ class RegExpExecDescriptor : public CallInterfaceDescriptor {
                                      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)