[Bug target/115255] sibcall at -O0 causes ICE in df_refs_verify on arm

[andi-gcc at firstfloor dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115255

--- Comment #7 from Andi Kleen <andi-gcc at firstfloor dot org> ---
The patch can be even more minimized. The thumb2_reorg change is not needed
because nothing does df_verify() after it (I just noticed it because I added
some extra for debugging). So even though thumb2_reorg breaks the DF with -O0
it doesn't matter because nobody cares.