[Bug rtl-optimization/70826] [7 regression] many test cases fail starting with r235442

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70826

--- Comment #5 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Can you reproduce that with the testcase reduced a bit? What does the mfcr
instruction do?