Faster implementation of integer-to-ascii conversion. I think....

src/heap.cc

Index: src/heap.cc
===================================================================
--- src/heap.cc	(revision 3813)
+++ src/heap.cc	(working copy)
@@ -1786,14 +1786,16 @@
   char arr[100];
   Vector<char> buffer(arr, ARRAY_SIZE(arr));
   const char* str;
+  int length = 0;
   if (number->IsSmi()) {
     int num = Smi::cast(number)->value();
-    str = IntToCString(num, buffer);
+    str = IntToCString(num, &length);
   } else {
     double num = HeapNumber::cast(number)->value();
     str = DoubleToCString(num, buffer);
+    length = strlen(str);
   }
-  Object* result = AllocateStringFromAscii(CStrVector(str));
+  Object* result = AllocateStringFromAscii(Vector<const char>(str, length));
 
   if (!result->IsFailure()) {
     SetNumberStringCache(number, String::cast(result));