Merge google-perftools r109 (the current contents of third_party/tcmalloc/vendor)

third_party/tcmalloc/chromium/src/raw_printer.cc

Index: third_party/tcmalloc/chromium/src/raw_printer.cc
===================================================================
--- third_party/tcmalloc/chromium/src/raw_printer.cc	(revision 87277)
+++ third_party/tcmalloc/chromium/src/raw_printer.cc	(working copy)
@@ -54,7 +54,7 @@
     int avail = limit_ - ptr_;
     // We pass avail+1 to vsnprintf() since that routine needs room
     // to store the trailing \0.
-    const int r = vsnprintf(ptr_, avail+1, format, ap);
+    const int r = perftools_vsnprintf(ptr_, avail+1, format, ap);
     va_end(ap);
     if (r < 0) {
       // Perhaps an old glibc that returns -1 on truncation?