cmd/internal/obj/ppc64: rename and remove aliased optab classifiers

Rename C_LCON, C_SCON, C_ADDCON, C_ANDCON into their aliased names
and remove them.

Change-Id: I8f67cc973f8059e65b81669d91a44500fc136b0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/563097
Run-TryBot: Paul Murphy <[email protected]>
Reviewed-by: Lynn Boger <[email protected]>
Reviewed-by: Than McIntosh <[email protected]>
Reviewed-by: David Chase <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: pmur

src/cmd/internal/obj/ppc64/a.out.go

@@ -449,12 +449,6 @@ const (
 	C_TEXTSIZE /* An argument with Type obj.TYPE_TEXTSIZE */
 
 	C_NCLASS /* must be the last */
-
-	/* Aliased names which should be cleaned up, or integrated. */
-	C_SCON   = C_U15CON
-	C_ADDCON = C_S16CON
-	C_ANDCON = C_U16CON
-	C_LCON   = C_32CON
 )
 
 const (