[cfe-commits] [patch][commit-after-review] asm comma-separated clobberlists

[Ryan Flynn]

patch to handle commas in clobberlists like gcc does. i.e. "=A,A"

the form "=AA" already appears to work, but the commas were causing
trouble in semantic validation ("," unrecognized) and in parsing
canonicalized asm (which already uses "," to separate constraints)

error found in FreeBSD driver, but examples found elsewhere for 32-bit
targets handling 64-bit math, i.e.
http://gcc.gnu.org/ml/gcc-bugs/2000-02/msg00104.html (search for
"=A,A")

passes all clang tests; i wanted a review because my asm-fu is weak.
let me know if this is horrible. thanks!

Ryan
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