[compiler-rt] Change all asm directives to __asm__ in cpu_model.
[compiler-rt] Change all asm directives to __asm__ in cpu_model.

Summary:
Aiming to resolve failure in sanitizer bot by changning all asm directives to __asm__.
Also, consistency.

Reviewers: llvm-commits, echristo, vitalybuka

Subscribers: mehdi_amini

Differential Revision: https://reviews.llvm.org/D22446

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@275740 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