a2a280e58c
`libomp` uses `__builtin_return_address` in two places. However, on some targets those calls need to wrapped in `___builtin_extract_return_addr` to get at the actual return address. SPARC is among those targets and the only one where `clang` actually implements this, cf. [[clang][Sparc] Fix __builtin_extract_return_addr etc.](https://reviews.llvm.org/D91607). `compiler-rt` needed the same adjustment, cf. [[sanitizer_common][test] Enable tests on SPARC](https://reviews.llvm.org/D91608). On other targets, this is a no-op. However, there are more targets that have the same issue and `gcc`, unlike `clang`, correctly implements it, so there might be issues when building `libomp` with `gcc`. This patch adds the necessary calls. Tested on `sparcv9-sun-solaris2.11`, `sparc64-unknown-linux-gnu`, `amd64-pc-solaris2.11`, and `x86_64-pc-linux-gnu`.
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