[PATCH] Fix assert on asm register that are "%"

[Olivier Goffart]

Hi, 

In TargetInfo::isValidGCCRegisterName the Name might be empty again after 
removing the %

Found on code like
  register int foo asm("%" MACRO);
where MACRO was supposed to be defined in a header file that was not found.

Regards

-- 
Olivier
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