move matching of named operands into AsmStmt class.  At the same
time handle + operands in operand counting, fixing asm.c:t7 to
expand into $2 instead of $1.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66531 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed