[Bug rtl-optimization/87720] [9 Regression] [MIPS] ICE: gcc.c-torture/execute/builtins/lib/chk.c:33:1: in int_mode_for_mode, at stor-layout.c:403 after r265398

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87720

--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Hi Paul,

How can the mode of dest be different from that of the source?  How does PC
get into this?  Could you show an example of bad / good RTL?