[X86] Clang option -fuse-init-array has no effect when generating for MCU target

Reviewers: Eugene.Zelenko, dschuff, craig.topper

Reviewed By: craig.topper

Subscribers: ahatanak, aaboud, DavidKreitzer, llvm-commits, cfe-commits

Differential Revision: https://reviews.llvm.org/D32543
Patch by AndreiGrischenko <andrei.l.grischenko@intel.com>

llvm-svn: 302513