Fix missing else keyword seen with clang-static-analyzer:

Fix missing else keyword seen with clang-static-analyzer:

2019-06-26  Martin Liska  <mliska@suse.cz>

	* bb-reorder.c (connect_better_edge_p): Add missing else
	statement in the middle of if-else statements.

/home/marxin/Programming/gcc/gcc/bb-reorder.c:1031:2: warning: Value stored to 'is_better_edge' is never read
        is_better_edge = true;
        ^                ~~~~
/home/marxin/Programming/gcc/gcc/bb-reorder.c:1034:2: warning: Value stored to 'is_better_edge' is never read
        is_better_edge = false;
        ^                ~~~~~

From-SVN: r272670