[PATCH] Preserve early clobber flag when using named registers in inline assembly.

[Daniel Sanders]

The argument to SimplifyConstraint() would omit the first character (always '=') and the function preserved the '&', giving '&r' as the result of SimplifyConstraint(). Each of the paths of AddVariableConstraints() that returned Constraint unmodified would also preserve the '&'. Then the code I added would prepend '=&' for the early clobber case giving '=&&r'.


http://reviews.llvm.org/D7346

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