combine.c (combine_simplify_rtx): Attempt to simplify a*(b/c) as (a*b)/c for floats...

combine.c (combine_simplify_rtx): Attempt to simplify a*(b/c) as (a*b)/c for floats in unsafe_math mode.

	* combine.c (combine_simplify_rtx): Attempt to simplify
	a*(b/c) as (a*b)/c for floats in unsafe_math mode.

	* simplify-rtx.c (avoid_constatn_pool_reference): New static function.
	(simplify_binary_operation, simplify_unary_operation,
	 simplify_relational_operation): Use it.

	* combine.c (combine_simplify_rtx): Don't do associative law
	on divisions; allow associative law on floats.

From-SVN: r44073