Revert of Use in-object fields instead of private symbols for regexp slots.

src/crankshaft/hydrogen.cc

Index: src/crankshaft/hydrogen.cc
diff --git a/src/crankshaft/hydrogen.cc b/src/crankshaft/hydrogen.cc
index 066eec3456c863d5655c2fd31ceb95d5a286a859..cfd843bfdc984de64fbd8b6e63faf5bf6319dc54 100644
--- a/src/crankshaft/hydrogen.cc
+++ b/src/crankshaft/hydrogen.cc
@@ -12644,26 +12644,6 @@
 }
 
 
-void HOptimizedGraphBuilder::GenerateRegExpFlags(CallRuntime* call) {
-  DCHECK_EQ(1, call->arguments()->length());
-  CHECK_ALIVE(VisitExpressions(call->arguments()));
-  HValue* regexp = Pop();
-  HInstruction* result =
-      New<HLoadNamedField>(regexp, nullptr, HObjectAccess::ForJSRegExpFlags());
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
-void HOptimizedGraphBuilder::GenerateRegExpSource(CallRuntime* call) {
-  DCHECK_EQ(1, call->arguments()->length());
-  CHECK_ALIVE(VisitExpressions(call->arguments()));
-  HValue* regexp = Pop();
-  HInstruction* result =
-      New<HLoadNamedField>(regexp, nullptr, HObjectAccess::ForJSRegExpSource());
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateDoubleLo(CallRuntime* call) {
   DCHECK_EQ(1, call->arguments()->length());
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));