Add support for ARMv7-M architecture which uses the Thumb 2 ISA (unified syntax)

Patch by Jérémie Faucher-Goulet!

Differential Revision: https://reviews.llvm.org/D60417

llvm-svn: 358642
GitOrigin-RevId: a88a020612cd781de68c5fd532318d13c45e25bc
2 files changed