Merge tcmalloc r111 (perftools v. 1.8) with the chromium/ branch.

third_party/tcmalloc/chromium/src/config_linux.h

Index: third_party/tcmalloc/chromium/src/config_linux.h
===================================================================
--- third_party/tcmalloc/chromium/src/config_linux.h	(revision 94429)
+++ third_party/tcmalloc/chromium/src/config_linux.h	(working copy)
@@ -188,6 +188,13 @@
    */
 #undef LT_OBJDIR
 
+/* Define to 'volatile' if __malloc_hook is declared volatile */
+#ifdef __MALLOC_HOOK_VOLATILE
+#define MALLOC_HOOK_MAYBE_VOLATILE volatile
+#else
+#define MALLOC_HOOK_MAYBE_VOLATILE
+#endif
+
 /* Define to 1 if your C compiler doesn't accept -c and -o together. */
 /* #undef NO_MINUS_C_MINUS_O */
 
@@ -231,6 +238,10 @@
 /* printf format code for printing a size_t and ssize_t */
 #define PRIxS "zx"
 
+/* Mark the systems where we know it's bad if pthreads runs too
+   early before main (before threads are initialized, presumably).  */
+#undef PTHREADS_CRASHES_IF_RUN_TOO_EARLY
+
 /* Define to necessary symbol if this constant uses a non-standard name on
    your system. */
 /* #undef PTHREAD_CREATE_JOINABLE */