[SPECCPU2017] Add additional platform options and missing flags.

Add portability flags for 64-bit Windows and Linux on ARM.

Also add missing SPEC and SPEC_CPU flags without which the compilation
could fail on these platforms.

Differential Revision: https://reviews.llvm.org/D48442

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@337326 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed