DSE: Trim stores of 0 like triming stores of {} [PR87901]

This is the second part of the PR which comes from transformation
of memset into either stores of 0 (via an integral type) or stores
of {}. We already handle stores of `{}`, this just extends that to
handle of the constant 0 and treat it similarly.

	PR tree-optimization/87901

gcc/ChangeLog:

	* tree-ssa-dse.cc (maybe_trim_constructor_store): Add was_integer_cst argument.
	Check for was_integer_cst instead of `{}` when was_integer_cst is true.
	(maybe_trim_partially_dead_store): Handle INTEGER_CST stores of 0 as stores of `{}`.
	Udpate call to maybe_trim_constructor_store for CONSTRUCTOR.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/ssa-dse-53.c: New test.
	* gcc.dg/tree-ssa/ssa-dse-54.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

0 files changed, 0 insertions, 0 deletions