[Bug lto/60461] [4.9 Regression] LTO linking error at -Os (and above) on x86_64-linux-gnu

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60461

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
It looks like when IPA SRA does

About to replace expr p.f1 with ISRA.3
Adjusting call fn2/3 -> fn1.isra.0/6
replacing stmt:fn1.isra.0 (a[0]);

it doesn't adjust IPA references for the load of a[0] it inserts and thus
the reference to 'a' from fn2 isn't present anymore when streaming them
out for WPA phase which then happily removes 'a' even though it is referenced
as

  _5 = MEM[(int *)&a];