[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)

[xry111 at gcc dot gnu.org via Gcc-bugs]

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

--- Comment #10 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
The issue is exploited by PR120242 fix that we've backported to 15, thus I'll
backport the fix to 15 as well to unbreak the test suite.