middle-end: Fix stalled swapped condition code value [PR115836]

middle-end: Fix stalled swapped condition code value [PR115836]

emit_store_flag_1 calculates scode (swapped condition code) at the
beginning of the function from the value of code variable.  However,
code variable may change before scode usage site, resulting in
invalid stalled scode value.

Move calculation of scode value just before its only usage site to
avoid stalled scode value.

	PR middle-end/115836

gcc/ChangeLog:

	* expmed.cc (emit_store_flag_1): Move calculation of
	scode just before its only usage site.