Revert "Integrate the Irregexp Regular Expression Engine."

runtime/vm/unibrow-inl.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_UNIBROW_INL_H_
 #define VM_UNIBROW_INL_H_
 
 #include "vm/unibrow.h"
 
-#include "platform/assert.h"
+// SNIP
 
 namespace unibrow {
 
-template <class T, intptr_t s> intptr_t Mapping<T, s>::get(
-    int32_t c, int32_t n, int32_t* result) {
+// SNIP
+
+template <class T, int s> int Mapping<T, s>::get(uchar c, uchar n,
+    uchar* result) {
   CacheEntry entry = entries_[c & kMask];
   if (entry.code_point_ == c) {
     if (entry.offset_ == 0) {
       return 0;
     } else {
       result[0] = c + entry.offset_;
       return 1;
     }
   } else {
     return CalculateValue(c, n, result);
   }
 }
 
-template <class T, intptr_t s> intptr_t Mapping<T, s>::CalculateValue(
-    int32_t c, int32_t n, int32_t* result) {
+template <class T, int s> int Mapping<T, s>::CalculateValue(uchar c, uchar n,
+    uchar* result) {
   bool allow_caching = true;
-  intptr_t length = T::Convert(c, n, result, &allow_caching);
+  int length = T::Convert(c, n, result, &allow_caching);
   if (allow_caching) {
     if (length == 1) {
       entries_[c & kMask] = CacheEntry(c, result[0] - c);
       return 1;
     } else {
       entries_[c & kMask] = CacheEntry(c, 0);
       return 0;
     }
   } else {
     return length;
   }
 }
 
+// SNIP
+
 }  // namespace unibrow
 
 #endif  // VM_UNIBROW_INL_H_