Johannes Doerfert ccc1324120 Introduce environment variables to deal with JIT IR ...

We can now dump the IR before and after JIT optimizations into the
files passed via `LIBOMPTARGET_JIT_PRE_OPT_IR_MODULE` and
`LIBOMPTARGET_JIT_POST_OPT_IR_MODULE`, respectively.

Similarly, users can set `LIBOMPTARGET_JIT_REPLACEMENT_MODULE` to
replace the IR in the image with a custom IR module in a file.
All options take file paths, documentation was added.

Reviewed by: tianshilei1992

Differential revision: https://reviews.llvm.org/D140945

2023-01-05 00:17:46 -08:00

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