Fix the UBSan inexpensive call sanitization

Fix the UBSan inexpensive call sanitization

The change imported in order to fix false positive -Wmaybe-uninitialized
in several packages in UBSan builds.

	* gimple.c: Include builtins.h
	(gimple_inexpensive_call_p): New function.
	* gimple.h (gimple_inexpensive_call_p): Declare.
	* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Use it.
	* tree-ssa-loop-ivcanon.c (tree_estimate_loop_size): Likewise;
	fix formatting.

upstream hash: f18de397b1e0523fd840800399ec6ea21ec04af8
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@237172 138bc75d-0d04-0410-961f-82ee72b054a4

Authored-by: hubicka
Change-Id: Ia58f6110f777f444c3679631f5406376e9e9925f
Signed-off-by: Slava Barinov <v.barinov@samsung.com>