[AArch64] Support reserving arbitrary general purpose registers
This is a follow up to D48580 and D48581 which allows reserving
arbitrary general purpose registers with the exception of registers
with special purpose (X8, X16-X18, X29, X30) and registers used by LLVM
(X0, X19). This change also generalizes some of the existing logic to
rely entirely on values generated from tablegen.
Differential Revision: https://reviews.llvm.org/D56305
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353957 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed
