Revert "Use arm instruction set with clang 7.0 LTO"

This reverts commit 94574f271fe8730d841a286069c198c6e74fc9e5.
Clang 7.0 LTO shouldn't need arm instruction set,
if we revert one LLVM recent change.

Bug: 72619014
Change-Id: Ic1ee146b823602ae419891f5e0956640109dd397
12 files changed