Update max stack depth values for regex parser

Summary:
This diff updates the max stack depth conditions to match those in
JSParserImpl.h. In addition, it increases the minimum stack depth
limit to 256 since some of our tests rely go to a depth of 200.

Reviewed By: avp

Differential Revision: D22341516

fbshipit-source-id: 4feddb6353f7549b54cd1d8e401d74766a1ed7f7

lib/Regex/RegexParser.cpp

@@ -63,9 +63,7 @@ class Parser {
   // overflow for overly complex expressions.
   static constexpr uint32_t kMaxParseDepth =
 #ifdef HERMES_LIMIT_STACK_DEPTH
-      128
-#elif defined(_MSC_VER) && defined(__clang__) && defined(HERMES_SLOW_DEBUG)
-      128
+      256
 #elif defined(_MSC_VER) && defined(HERMES_SLOW_DEBUG)
       256
 #elif defined(_MSC_VER)