Reland of [turbofan] Introduce proper JSCreateLiteralRegExp operator.

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index 9d744a8f2dea1000b81602b7999dfd44961e6be0..3c8b7bb22dbe2b2776cf531a28b0cc4cda1afcc4 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -404,19 +404,19 @@
 
 
 // Defines shared information for the literal that should be created. This is
-// used as parameter by JSCreateLiteralArray and JSCreateLiteralObject
-// operators.
+// used as parameter by JSCreateLiteralArray, JSCreateLiteralObject and
+// JSCreateLiteralRegExp operators.
 class CreateLiteralParameters final {
  public:
-  CreateLiteralParameters(Handle<FixedArray> constants, int flags, int index)
-      : constants_(constants), flags_(flags), index_(index) {}
-
-  Handle<FixedArray> constants() const { return constants_; }
+  CreateLiteralParameters(Handle<HeapObject> constant, int flags, int index)
+      : constant_(constant), flags_(flags), index_(index) {}
+
+  Handle<HeapObject> constant() const { return constant_; }
   int flags() const { return flags_; }
   int index() const { return index_; }
 
  private:
-  Handle<FixedArray> const constants_;
+  Handle<HeapObject> const constant_;
   int const flags_;
   int const index_;
 };
@@ -476,6 +476,8 @@
                                      int literal_flags, int literal_index);
   const Operator* CreateLiteralObject(Handle<FixedArray> constant_properties,
                                       int literal_flags, int literal_index);
+  const Operator* CreateLiteralRegExp(Handle<String> constant_pattern,
+                                      int literal_flags, int literal_index);
 
   const Operator* CallFunction(
       size_t arity, LanguageMode language_mode,