Cleanup latin-1 conversion check in regexp engine

src/unicode-inl.h

 // Copyright 2007-2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 61 matching lines @@
     } else {
       entries_[c & kMask] = CacheEntry(c, 0);
       return 0;
     }
   } else {
     return length;
   }
 }
 
 
+bool Latin1::NonLatin1CanBeConvertedToLatin1(uint16_t c) {
+  ASSERT(c > Latin1::kMaxChar);
+  switch (c) {
+    case 0x130:
+    case 0x131:
+    case 0x149:
+    case 0x178:
+    case 0x17f:
+    case 0x1f0:
+    case 0x1e96:
+    case 0x1e97:
+    case 0x1e98:
+    case 0x1e99:
+    case 0x1e9a:
+    case 0x1e9e:
+    case 0x212a:
+    case 0x212b:
+    case 0xfb00:
+    case 0xfb01:
+    case 0xfb02:
+    case 0xfb03:
+    case 0xfb04:
+    case 0xfb05:
+    case 0xfb06:
+      return true;
+  }
+  return false;
+}
+
+
 unsigned Utf8::Encode(char* str, uchar c, int previous) {
   static const int kMask = ~(1 << 6);
   if (c <= kMaxOneByteChar) {
     str[0] = c;
     return 1;
   } else if (c <= kMaxTwoByteChar) {
     str[0] = 0xC0 | (c >> 6);
     str[1] = 0x80 | (c & kMask);
     return 2;
   } else if (c <= kMaxThreeByteChar) {
@@ skipping 88 matching lines @@
   // Copy the rest the slow way.
   WriteUtf16Slow(unbuffered_start_,
                  data + buffer_length,
                  length - buffer_length);
   return length;
 }
 
 }  // namespace unibrow
 
 #endif  // V8_UNICODE_INL_H_