PR inline-asm/39543
	* fwprop.c (forward_propagate_asm): New function.
	(forward_propagate_and_simplify): Propagate also into __asm, if it
	doesn't increase the number of referenced registers.

	* gcc.target/i386/pr39543-1.c: New test.
	* gcc.target/i386/pr39543-2.c: New test.
	* gcc.target/i386/pr39543-3.c: New test.

From-SVN: r146813