[clang] [compiler-rt] [llvm] [Hexagon] Add ShadowCallStack support (PR #200508)

[via llvm-commits]

bohara-qti wrote:

Looks good (though haven't touched CFI much). Is there a directed EH test that checks unwind fires N times and R19 matches original value? In the epilogue CHECK-DAG, can the memw/add ever get reordered?

https://github.com/llvm/llvm-project/pull/200508