[Bug target/81286] [6/7 Regression] building for powerpc*-unknown-linux-gnu target fails with RTL checking enabled

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81286

--- Comment #2 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Jakub Jelinek from comment #1)
> Created attachment 41666 [details]
> gcc7-pr81286.patch
> 
> Untested fix.  gpc_reg_operand allows in some cases a SUBREG of a REG, but
> REGNO is not valid in that case.

I can confirm that I can build both 6-branch and 7-branch with the patch
applied.