re PR rtl-optimization/78911 (Infinite loop at -O2/O3 optimization levels while trying to compile server.c from Wine-2.0-rc2)

	PR rtl-optimization/78911
	* lra-assigns.c (must_not_spill_p): New function.
	(spill_for): Use it.

	PR rtl-optimization/78911
	* gcc.target/i386/pr78911-1.c: New test.
	* gcc.target/i386/pr78911-2.c: New test.

From-SVN: r246059