Correction so -fchech-memory-usage only flushes hard registers to temp memory location.

Correction so -fchech-memory-usage only flushes hard registers to temp
memory location.  Values in psuedo registers and memory shouldn't be
affected.

From-SVN: r37583

gcc/ChangeLog

+2000-11-20  Will Cohen  <wcohen@redhat.com>
+
+	* calls.c (expand_call): Clear target only when target is in
+	hard register and current_function_check_memory_usage is set.
+
 2000-11-20  Bernd Schmidt  <bernds@redhat.co.uk>
 
 	* toplev.c (rest_of_compilation): Run optimize_mode_switching even