[Bug target/57708] function clobbers callee saved register on ARM

[mikulas at artax dot karlin.mff.cuni.cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57708

--- Comment #2 from mikulas at artax dot karlin.mff.cuni.cz ---
Created attachment 30362
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30362&action=edit
another reproduction code

The code in the first attachment actually did some out-of-memory accesses
because I simplified it too much. This is the second attachment that should be
correct.