Make __cpu_model a hidden symbol, to match libgcc.
Also hide __cpu_inicator_init and __cpu_features2
for similar reasons.

Summary: Make __cpu_model a hidden symbol, to match libgcc.

Subscribers: llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59561

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@356581 91177308-0d34-0410-b5e6-96231b3b80d8