tests/fpu: Test FPU unavailable interrupt following a load

This adds a load before a floating-point load which should generate a
floating-point unavailable interrupt, to test for the bug where
unavailability interrupts can get dropped while loadstore1 is
executing instructions.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

tests/fpu/fpu.c

@@ -106,9 +106,11 @@ int fooiw;
 
 int do_fp_op(long arg)
 {
+	unsigned long tmp;
+
 	switch (arg) {
 	case 0:
-		asm("lfd 31,0(%0)" : : "b" (&foo));
+		asm("ld %0,0(%1); lfd 31,0(%1)" : "=&r" (tmp) : "b" (&foo));
 		break;
 	case 1:
 		asm("stfd 31,0(%0)" : : "b" (&foow) : "memory");