Revert "Use arm instruction set with clang 7.0 LTO"

This reverts commit ffb5375c37804f84750a2092779ced5b986850a3.
Clang 7.0 LTO shouldn't need arm instruction set,
if we revert one LLVM recent change.

Bug: 72619014
Change-Id: I513fc78b2fde7ee95cd1bf2153dd647d2fbd196e
Merged-In: Ic1ee146b823602ae419891f5e0956640109dd397
9 files changed