Generate correct ARM vfp code for x++ where x is single precision float.
Example test program (link with '5l -f'): void _main() { float x; x++;}

Reference: /n/sources/patch/applied/5l-incfloat
Date: Sat Oct  5 20:57:16 CES 2013
Signed-off-by: miller@hamnavoe.com

--- /sys/src/cmd/5l/obj.c	Sat Oct  5 20:52:56 2013
+++ /sys/src/cmd/5l/obj.c	Sat Oct  5 20:52:51 2013
@@ -1078,6 +1078,11 @@
 		}
 		goto casedef;
 
+	case AMOVDF:
+		if(!vfp || p->from.type != D_FCONST)
+			goto casedef;
+		p->as = AMOVF;
+		/* fall through */
 	case AMOVF:
 		if(skip)
 			goto casedef;