Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/stacktrace_config.h

Index: third_party/tcmalloc/vendor/src/stacktrace_config.h
diff --git a/third_party/tcmalloc/vendor/src/stacktrace_config.h b/third_party/tcmalloc/vendor/src/stacktrace_config.h
index b166ca272dee2e1cb67cbe8b80f5a7ac89e58080..72d108a8c24ec50742e1e70fd9ab7a226f707742 100644
--- a/third_party/tcmalloc/vendor/src/stacktrace_config.h
+++ b/third_party/tcmalloc/vendor/src/stacktrace_config.h
@@ -46,11 +46,8 @@
 #ifndef BASE_STACKTRACE_CONFIG_H_
 #define BASE_STACKTRACE_CONFIG_H_
 
-#ifdef __native_client__
-#  define STACKTRACE_INL_HEADER "base/stacktrace_nacl-inl.h"
-
-// i386 and x86_64 case.
-#elif (defined(__i386__) || defined(__x86_64__)) && __GNUC__ >= 2
+// First, the i386 and x86_64 case.
+#if (defined(__i386__) || defined(__x86_64__)) && __GNUC__ >= 2
 # if !defined(NO_FRAME_POINTER)
 #   define STACKTRACE_INL_HEADER "stacktrace_x86-inl.h"
 #   define STACKTRACE_SKIP_CONTEXT_ROUTINES 1
@@ -71,6 +68,14 @@
 #   define STACKTRACE_INL_HEADER "stacktrace_generic-inl.h"
 # endif
 
+// The ARM case
+#elif defined(__arm__)  && __GNUC__ >= 2
+# if !defined(NO_FRAME_POINTER)
+#   define STACKTRACE_INL_HEADER "stacktrace_arm-inl.h"
+# else
+#   error stacktrace without frame pointer is not supported on ARM
+# endif
+
 // The Windows case -- probably cygwin and mingw will use one of the
 // x86-includes above, but if not, we can fall back to windows intrinsics.
 #elif defined(_WIN32) || defined(__CYGWIN__) || defined(__CYGWIN32__) || defined(__MINGW32__)