re PR c++/89698 (Run-time error due to optimization of field access after cast at -Os/-O2 and higher)

2019-05-03  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/89698
	* gimple-fold.c (canonicalize_constructor_val): Early out
	for constants, handle unfolded INTEGER_CSTs as they appear in
	C++ virtual table ctors.

	* g++.dg/tree-ssa/pr89698.C: New testcase.

From-SVN: r270833