libgo: Merge from revision 18783:00cce3a34d7e of master library.

This revision was committed January 7, 2014.  The next
revision deleted runtime/mfinal.c.  That will be done in a
subsequent merge.

This merge changes type descriptors to add a zero field,
pointing to a zero value for that type.  This is implemented
as a common variable.

	* go-gcc.cc (Gcc_backend::implicit_variable): Add is_common and
	alignment parameters.  Permit init parameter to be NULL.

From-SVN: r211249

libgo/go/crypto/cipher/cipher.go

@@ -46,16 +46,6 @@ type BlockMode interface {
 
 // Utility routines
 
-func shift1(dst, src []byte) byte {
-	var b byte
-	for i := len(src) - 1; i >= 0; i-- {
-		bb := src[i] >> 7
-		dst[i] = src[i]<<1 | b
-		b = bb
-	}
-	return b
-}
-
 func dup(p []byte) []byte {
 	q := make([]byte, len(p))
 	copy(q, p)