Eric Christopher d40f06b48f Add support for the 'x' constraint.
Part of rdar://9307836 and rdar://9119939

llvm-svn: 134215
2011-07-01 00:14:47 +00:00
..
2011-06-17 14:16:17 +00:00
2011-06-22 23:23:19 +00:00