[llvm] [CodeGenPrepare] Folding `urem` with loop invariant value as remainder (PR #96625)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Affected files:
```
abseil-cpp/optimized/duration_test.cc.ll
abseil-cpp/optimized/examples_test.cc.ll
abseil-cpp/optimized/explicit_seed_seq_test.cc.ll
abseil-cpp/optimized/nonsecure_base_test.cc.ll
abseil-cpp/optimized/pcg_engine_test.cc.ll
abseil-cpp/optimized/randen_engine_test.cc.ll
abseil-cpp/optimized/salted_seed_seq_test.cc.ll
abseil-cpp/optimized/seed_sequences_test.cc.ll
actix-rs/optimized/4i8sqy4dbcgvpe7w.ll
assimp/optimized/clipper.cpp.ll
brotli/optimized/block_splitter.c.ll
cpp-httplib/optimized/httplib.cc.ll
darktable/optimized/ArwDecoder.cpp.ll
darktable/optimized/introspection_colorbalancergb.c.ll
darktable/optimized/introspection_demosaic.c.ll
folly/optimized/Random.cpp.ll
graphviz/optimized/gvrender_core_mp.c.ll
gromacs/optimized/gmx_clustsize.cpp.ll
gromacs/optimized/gmx_xpm2ps.cpp.ll
harfbuzz/optimized/hb-subset.cc.ll
hyperscan/optimized/rose_build_bytecode.cpp.ll
image-rs/optimized/1clnprdgqfw2q9lq.ll
libevent/optimized/evutil_rand.c.ll
meshlab/optimized/ml_scene_gl_shared_data_context.cpp.ll
meshlab/optimized/trackmode.cpp.ll
minetest/optimized/texturesource.cpp.ll
ocio/optimized/MatrixOpData.cpp.ll
oiio/optimized/tiffinput.cpp.ll
php/optimized/string.ll
wasmtime-rs/optimized/4qgt4edt0wnnlcua.ll
wireshark/optimized/packet-pkcs12.c.ll
```

https://github.com/llvm/llvm-project/pull/96625