[ARM] Cleanup ARM CGP isSupportedValue
isSupportedValue explicitly checked and accepted many types of value,
primarily for debugging reasons. Remove most of these checks and do a
bit of refactoring now that the pass is more stable. This also enables
ZExts to be sources, but this has very little practical benefit at the
moment extend instructions will still be introduced.
Differential Revision: https://reviews.llvm.org/D52080
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342395
91177308-0d34-0410-b5e6-
96231b3b80d8
OSDN Git Service
