s390: convert ".insn" encoding to instruction names

With z10 as minimum supported machine generation many ".insn" encodings
could be now converted to instruction names. There are couple of exceptions
- stfle is used from the als code built for z900 and cannot be converted
- few ".insn" directives encode unsupported instruction formats

The generated code is identical before/after this change.

Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/processor.h

@@ -225,8 +225,7 @@ static inline unsigned long __ecag(unsigned int asi, unsigned char parm)
 {
 	unsigned long val;
 
-	asm volatile(".insn	rsy,0xeb000000004c,%0,0,0(%1)" /* ecag */
-		     : "=d" (val) : "a" (asi << 8 | parm));
+	asm volatile("ecag %0,0,0(%1)" : "=d" (val) : "a" (asi << 8 | parm));
 	return val;
 }