test-suite: add cpu architecture detection in cmake configuration

Summary:
This patch adds opportunity to identify cpu target using cpuid, when you use cmake configuration. Then this CPU_ARCH variable can be used for adding options, disabling or enabling tests for given cpu architectures.

Patch with similar feature for make+configure approach -[[ https://reviews.llvm.org/D38182  |  D38182]].

Reviewers: zvi, eladcohen, MatzeB, jmolloy

Reviewed By: MatzeB

Subscribers: mgorny

Differential Revision: https://reviews.llvm.org/D38484

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@321143 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed