Arnold Schwaighofer 26f016f143 SwiftCC: swifterror register cannot be as the base register
Functions that have a dynamic alloca require a base register which is defined to
be X19 on AArch64 and r6 on ARM.  We have defined the swifterror register to be
the same register. Use a different callee save register for swifterror instead:

 X21 on AArch64
 R8 on ARM

rdar://30433803

llvm-svn: 294551
2017-02-09 01:52:17 +00:00
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