[sanitizer][NFCI] Add ASan/HWASan regression tests for @llvm.coro.id with promise allocas (#154894)
ASan and HWASan did not play nicely with @llvm.coro.id's that had
non-null promises: rewriting the promise alloca violated the assumptions
of the coro-early pass (see
https://github.com/llvm/llvm-project/issues/154830#issuecomment-3212314668
for analysis). Although this issue has been worked around already in
ASan and HWASan (somewhat crudely, by disabling instrumentation for the
entire presplit function;
https://github.com/llvm/llvm-project/pull/99415,
https://github.com/llvm/llvm-project/pull/154803), there is no test
coverage to check the compiler would crash without the workarounds, if
coro-early was run after ASan/HWASan (the existing `split-coro.ll` runs
the passes in the opposite order and checks that ASan skips
instrumentation).
This patch adds simple tests (which succeed with the existing
workarounds, and would crash without). These will be useful for tracking
progress towards better workarounds.
llvm-project
3e39820e - [sanitizer][NFCI] Add ASan/HWASan regression tests for @llvm.coro.id with promise allocas (#154894)
