[Bug target/123852] [16 Regression] ada bootstrap failure on sh4-linux-gnu since r16-3067

[paul at crapouillou dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123852

--- Comment #31 from Paul Cercueil <paul at crapouillou dot net> ---
Created attachment 64004
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=64004&action=edit
Reproducer for libpng ICE

Might be unrelated to this exact bug, but I still have an ICE when compiling
libpng, with -O3 this time (-O2 and lower is fine). See attachment.

during RTL pass: late_combine
pngwrite.c: In function 'png_image_set_PLTE.isra':
pngwrite.c:1927:1: internal compiler error: in apply_to_rvalue_1, at
recog.cc:1128
 1927 | }
      | ^
0x192b0e5 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
        ???:0
0x19249ec internal_error(char const*, ...)
        ???:0
0x69bf55 fancy_abort(char const*, int, char const*)
        ???:0
0xca22af insn_propagation::apply_to_rvalue_1(rtx_def**)
        ???:0
0xca2add insn_propagation::apply_to_mem_1(rtx_def*)
        ???:0
0xca2daf insn_propagation::apply_to_pattern(rtx_def**)
        ???:0