tree-optimization/105109 - bogus uninit diagnostic with _Complex

tree-optimization/105109 - bogus uninit diagnostic with _Complex

When update_address_taken rewrites a _Complex into SSA it changes
stores to real/imaginary parts to loads of the other component and
a COMPLEX_EXPR.  That matches what gimplification does but it misses
suppression of diagnostics for the load of the other component.
The following patch adds that, syncing up gimplification and
update_address_taken behavior.

2022-03-31  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/105109
	* tree-ssa.cc (execute_update_addresses_taken): Suppress
	diagnostics on the load of the other complex component.

	* gcc.dg/uninit-pr105109.c: New testcase.