[patch] Don't add x86 segment registers to the clobber list

[Nico Weber]

Hi,

the attached patch makes it so that cs, ds, es, fs, gs, and ss no longer
are added to the implicit clobber list by AsmParser::parseMSInlineAsm().
Clang tries to check the clobber list but doesn't list these registers in
its x86 register list (and gcc doesn't allow listing them as clobber
registers either). This fixes PR20343. The test will be landed on the clang
side, it'll look like the test in
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140714/110476.html
(except that cs and friends will no longer be listed on the clobber list.)

Nico
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