PR tree-optimization/84480 - bogus -Wstringop-truncation despite assignment with an inlined string literal

gcc/ChangeLog:

	PR tree-optimization/84480
	* gimple-fold.c (gimple_fold_builtin_strcpy): Move warnings
	to maybe_diag_stxncpy_trunc.  Call it.
	* tree-ssa-strlen.c (maybe_diag_stxncpy_trunc): Integrate warnings
	from gimple_fold_builtin_strcpy.  Print inlining stack.
	(handle_builtin_stxncpy): Print inlining stack.
	* tree-ssa-strlen.h (maybe_diag_stxncpy_trunc): Declare.

gcc/testsuite/ChangeLog:

	PR tree-optimization/84480
	* c-c++-common/Wstringop-truncation.c: Adjust text of expected warnings.
	* g++.dg/warn/Wstringop-truncation-1.C: New test.

From-SVN: r257910