re PR middle-end/36194 (Truncation optimization in combine can remove necessary trunc...

re PR middle-end/36194 (Truncation optimization in combine can remove necessary truncations)

	PR middle-end/36194
        * combine.c (check_conversion): Rename to check_promoted_subreg.
        Don't call record_truncated_value from here.
        (record_truncated_value): Turn it into a for_each_rtx callback.
        (record_truncated_values): New function.
        (combine_instructions): Call note_uses with
        record_truncated_values.  Change name of check_conversion to
        check_promoted_subreg.

testsuite/

	* gcc.dg/pr36194.c: New test.

From-SVN: r135392