[ms-inline asm] Add constraints to MSAsmStmt.  We don't currently compute
the constraints, so in the interim we speculatively assume a 'r' constraint.
This is expected to work for most cases on x86.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@162784 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed