[ARM] Make coprocessor number restrictions consistent.

Authored by simon_tatham on Jun 27 2019, 5:40 AM.


[ARM] Make coprocessor number restrictions consistent.

Different versions of the Arm architecture disallow the use of generic
coprocessor instructions like MCR and CDP on different sets of
coprocessors. This commit centralises the check of the coprocessor
number so that it's consistent between assembly and disassembly, and
also updates it for the new restrictions in Arm v8.1-M.

New tests added that check all the coprocessor numbers; old tests
updated, where they used a number that's now become illegal in the
context in question.

Reviewers: DavidSpickett, ostannard

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63863

llvm-svn: 364532