[Bug rtl-optimization/120983] recog violates earlyclobber with user-defined hard register before reload (causing ICE on gcc.target/loongarch/bitwise-shift-reassoc-clobber.c)

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120983

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Please attach a testcase, and how to compile the code (-O2 etc.).  Oh, and fill
in
the target field :-)