Add support to the ARM MC infrastructure to support mcr and friends. This requires supporting the symbolic immediate names used for these instructions, fixing their pretty-printers, and adding proper encoding information for them.
Add support to the ARM MC infrastructure to support mcr and friends. This requires supporting
the symbolic immediate names used for these instructions, fixing their pretty-printers, and
adding proper encoding information for them.

With this, we can properly pretty-print and encode assembly like:
	mrc p15, #0, r3, c13, c0, #3

Fixes <rdar://problem/8857858>.


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@123404 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx