[Bug tree-optimization/61931] Wrong Constant Folding

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61931

--- Comment #5 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Created attachment 34307
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34307&action=edit
backport of r197965 (without neon bits) + testcase

Patch which fixes this testcase; I'll do a full bootstrap and testsuite run
with it next week.