[PATCH] [Sanitizer] Add Symbolizer::AddHooks() and use it in TSan and MSan.

[Evgeniy Stepanov]

  Do we still need SymbolizerScope in msan.h ?


================
Comment at: lib/sanitizer_common/sanitizer_symbolizer.cc:45
@@ +44,3 @@
+                          Symbolizer::EndSymbolizationHook end_hook) {
+  start_hook_ = start_hook;
+  end_hook_ = end_hook;
----------------
check that we are not calling this twice


http://llvm-reviews.chandlerc.com/D2067