Incorrect arithmetic optimization involving bitfield arguments

Incorrect arithmetic optimization involving bitfield arguments

gcc/ChangeLog:

2016-09-21  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/72835
	* tree-ssa-reassoc.c (make_new_ssa_for_def): New.
	(make_new_ssa_for_all_defs): Likewise.
	(zero_one_operation): Replace all SSA_NAMEs defined in the chain.

gcc/testsuite/ChangeLog:

2016-09-21  Kugan Vivekanandarajah  <kuganv@linaro.org>

	PR tree-optimization/72835
	* gcc.dg/tree-ssa/pr72835.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@240299 138bc75d-0d04-0410-961f-82ee72b054a4