[compiler-rt] [tsan] Fix GetTls for aarch64
[compiler-rt] [tsan] Fix GetTls for aarch64

This patch fix the function GetTls for aarch64, where it assumes it
follows the x86_64 way where the TLS initial address is at the end
of TLS.  Instead aarch64 set the TLS address as the thread pointer.


git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@246148 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt