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[AArch64][libunwind] Unwinding support for return address signing with B Key

Authored by LukeCheeseman on Dec 17 2018, 3:43 AM.

Description

[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