[runtime] Implement encodeURI as single runtime function.

src/utils.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 19 matching lines @@
 // Returns the value (0 .. 15) of a hexadecimal character c.
 // If c is not a legal hexadecimal character, returns a value < 0.
 inline int HexValue(uc32 c) {
   c -= '0';
   if (static_cast<unsigned>(c) <= 9) return c;
   c = (c | 0x20) - ('a' - '0');  // detect 0x11..0x16 and 0x31..0x36.
   if (static_cast<unsigned>(c) <= 5) return c + 10;
   return -1;
 }
 
+inline char HexCharOfValue(int value) {
+  DCHECK(0 <= value && value <= 16);
+  if (value < 10) return value + '0';
+  return value - 10 + 'A';
+}
 
 inline int BoolToInt(bool b) { return b ? 1 : 0; }
 
 
 // Same as strcmp, but can handle NULL arguments.
 inline bool CStringEquals(const char* s1, const char* s2) {
   return (s1 == s2) || (s1 != NULL && s2 != NULL && strcmp(s1, s2) == 0);
 }
 
 
@@ skipping 1490 matching lines @@
 }
 
 static inline void WriteUnalignedUInt32(void* p, uint32_t value) {
   WriteUnalignedValue(p, value);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_