Luke Cheeseman 357973192d [AArch64][libunwind] Unwinding support for return address signing with B Key
- Support for the case where the return address has been signed with the B key
- When the B key is used, a 'B' character is present in the augmentation string
  of CIE associated with the FDE for the function.

Differential Revision: https://reviews.llvm.org/D55704

llvm-svn: 349339
2018-12-17 11:43:24 +00:00
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