Ilya Leoshkevich 8e810dc7d9 [SystemZ] Support builtin_{frame,return}_address() with non-zero argument (#69405) ...

When the code is built with -mbackchain, it is possible to retrieve the
caller's frame and return addresses. GCC already can do this, add this
support to Clang as well. Use RISCVTargetLowering and GCC's
s390_return_addr_rtx() as inspiration. Add tests based on what GCC is
emitting.

2023-10-18 19:05:31 +02:00

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