re PR tree-optimization/61328 (valgrind finds problem in find_bswap_or_nop_1)

re PR tree-optimization/61328 (valgrind finds problem in find_bswap_or_nop_1)

2014-06-03  Thomas Preud'homme  <thomas.preudhomme@arm.com>

	PR tree-optimization/61328
	* tree-ssa-math-opts.c (init_symbolic_number): Extract symbolic number
        initialization from find_bswap_or_nop_1.
        (find_bswap_or_nop_1): Test return value of find_bswap_or_nop_1 stored
        in source_expr2 before using the size value the function sets. Also
        make use of init_symbolic_number () in both the old place and
        find_bswap_or_nop_load () to avoid reading uninitialized memory when
        doing recursion in the GIMPLE_BINARY_RHS case.

From-SVN: r211166