[PATCH] D41121: [sanitizer] Introduce a vDSO aware timing function

[Kostya Kortchinsky via Phabricator via llvm-commits]

cryptoad created this revision.
cryptoad added a reviewer: alekseyshl.
Herald added subscribers: Sanitizers, krytarowski, kubamracek, srhines.

See https://reviews.llvm.org/D40657 & https://reviews.llvm.org/D40679 for previous versions of this patch & description.

A couple of things were fixed here to have it not break some bots.
Weak symbols can't be used with `SANITIZER_GO` so the previous version was
breakin TsanGo. I set up some additional local tests and those pass now.

I changed the workaround for the glibc vDSO issue: `__progname` is initialized
after the vDSO and is actually public and of known type, unlike
`__vdso_clock_gettime`. This works better, and with all compilers.

The rest is the same.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D41121

Files:
  lib/sanitizer_common/sanitizer_allocator_primary64.h
  lib/sanitizer_common/sanitizer_common.h
  lib/sanitizer_common/sanitizer_common_interceptors.inc
  lib/sanitizer_common/sanitizer_fuchsia.cc
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_linux.h
  lib/sanitizer_common/sanitizer_linux_libcdep.cc
  lib/sanitizer_common/sanitizer_mac.cc
  lib/sanitizer_common/sanitizer_syscall_generic.inc
  lib/sanitizer_common/sanitizer_win.cc
  lib/scudo/scudo_allocator.cpp
  lib/scudo/scudo_tsd.h

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