Luke Cheeseman 8284b19c76 [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

llvm-svn: 342895
2018-09-24 15:55:35 +00:00
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