[runtime] First step to sanitize regexp literal creation.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 8f919ea370a286c4e84a081fbf4243cdc3c85121..8bf470115d1d79b4d1fadac2a5c3eff39ad7551a 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -70,6 +70,7 @@ namespace internal {
   V(CreateAllocationSite)                   \
   V(CreateWeakCell)                         \
   V(ElementsTransitionAndStore)             \
+  V(FastCloneRegExp)                        \
   V(FastCloneShallowArray)                  \
   V(FastCloneShallowObject)                 \
   V(FastNewClosure)                         \
@@ -793,6 +794,16 @@ class FastNewContextStub final : public HydrogenCodeStub {
 };
 
 
+class FastCloneRegExpStub final : public HydrogenCodeStub {
+ public:
+  explicit FastCloneRegExpStub(Isolate* isolate) : HydrogenCodeStub(isolate) {}
+
+ private:
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(FastCloneRegExp);
+  DEFINE_HYDROGEN_CODE_STUB(FastCloneRegExp, HydrogenCodeStub);
+};
+
+
 class FastCloneShallowArrayStub : public HydrogenCodeStub {
  public:
   FastCloneShallowArrayStub(Isolate* isolate,