Check the specific target to figure out if a constraint is a valid
register constraint. Note that we're not checking if the register itself
is valid for the constraint.

Fixes rdar://9382985


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133226 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed