code review 91850043: cmd/gc: alias more variables during register allocation

src/cmd/5g/cgen.c

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include <u.h>
 #include <libc.h>
 #include "gg.h"
 
 /*
  * generate:
@@ skipping 236 matching lines @@
                 gins(optoas(OMINUS, nl->type), &n2, &n1);
                 gmove(&n1, res);
                 regfree(&n1);
                 goto ret;
 
         // symmetric binary
         case OAND:
         case OOR:
         case OXOR:
         case OADD:
+        case OADDPTR:
         case OMUL:
                 a = optoas(n->op, nl->type);
                 goto sbop;
 
         // asymmetric binary
         case OSUB:
                 a = optoas(n->op, nl->type);
                 goto abop;
 
         case OHMUL:
@@ skipping 1493 matching lines @@
                 regfree(&nodl);
         return 0;
 
 yes:
         if(freer)
                 regfree(&nodr);
         if(freel)
                 regfree(&nodl);
         return 1;
 }