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[AArch64] Unwinding support for return address signing

Description

[AArch64] Unwinding support for return address signing

  • When return address signing is enabled, the LR may be signed on function entry
  • When an exception is thrown the return address is inspected used to unwind the call stack
  • Before this happens, the return address must be correctly authenticated to avoid causing an abort by dereferencing the signed pointer

Differential Revision: https://reviews.llvm.org/D51432