[Bug tree-optimization/71050] [7 regression] test case gcc.target/powerpc/lhs-1.c fails starting with r236066

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71050

--- Comment #11 from Segher Boessenkool <segher at gcc dot gnu.org> ---
No, please go ahead, I couldn't find an easy way out.  The generic
code is hell-bent on using a subreg of the DF reg.

The backend won't necessarily use any nop here btw, but the testcase
should be pretty stable with just checking for any nop, it is small
enough generated code.  Might want to add a comment saying exactly
what it tries to test (i.e., there should be enough nops to force the
load into a different issue group than the store is in).