[Bug sanitizer/59018] [4.9 Regression] libsanitizer doesn't build for x32

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59018

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Kostya Serebryany from comment #1)
> At least one of these patches does not build with clang:
> 
> /home/kcc/llvm/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc:
> 807:21: error: ignored asm label 'r8' on automatic variable [-Werror]
>   void *r8 __asm__ ("r8") = newtls;
>                     ^
> /home/kcc/llvm/projects/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc:
> 808:21: error: ignored asm label 'r10' on automatic variable [-Werror]
>   int *r10 __asm__ ("r10") = child_tidptr;
>                     ^
> 
> is this some kind of gcc-specific syntax? 

There is missing register keyword of course for both.
So
  register void *r8 __asm__ ("r8") = newtls;
  register int *r10 __asm__ ("r10") = child_tidptr;