Roman Divacky 7e6b5955d4 Introduce CPUStringIsValid() into MCSubtargetInfo and use it for ARM .cpu parsing.
Previously .cpu directive in ARM assembler didnt switch to the new CPU and
therefore acted as a nop. This implemented real action for .cpu and eg. 
allows to assembler FreeBSD kernel with -integrated-as.

llvm-svn: 223147
2014-12-02 20:03:22 +00:00
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