liblink, cmd/gc, cmd/{5,6,8}{a,c}: rename linkwriteobj to writeobj

The name linkwriteobj is misleading because it implies that
the function has something to do with the linker, which it
does not.  The name is historical: the function performs an
operation that was previously performed by the linker, but no
longer is.

LGTM=rsc
R=rsc, minux.ma
CC=golang-codereviews
https://golang.org/cl/88210045

include/link.h

@@ -571,7 +571,7 @@ void	linkprfile(Link *ctxt, int32 l);
 
 // objfile.c
 void	ldobjfile(Link *ctxt, Biobuf *b, char *pkg, int64 len, char *path);
-void	linkwriteobj(Link *ctxt, Biobuf *b);
+void	writeobj(Link *ctxt, Biobuf *b);
 
 // pass.c
 Prog*	brchain(Link *ctxt, Prog *p);

src/cmd/5a/lex.c

@@ -172,7 +172,7 @@ assemble(char *file)
 			return nerrors;
 	}
 
-	linkwriteobj(ctxt, &obuf);
+	writeobj(ctxt, &obuf);
 	Bflush(&obuf);
 	return 0;
 }

src/cmd/5c/swt.c

@@ -365,7 +365,7 @@ outcode(void)
 	}
 	Bprint(&outbuf, "!\n");
 
-	linkwriteobj(ctxt, &outbuf);
+	writeobj(ctxt, &outbuf);
 	lastp = P;
 }
 

src/cmd/6a/lex.c

@@ -182,7 +182,7 @@ assemble(char *file)
 			return nerrors;
 	}
 
-	linkwriteobj(ctxt, &obuf);
+	writeobj(ctxt, &obuf);
 	Bflush(&obuf);
 	return 0;
 }

src/cmd/6c/swt.c

@@ -239,7 +239,7 @@ outcode(void)
 	}
 	Bprint(&b, "!\n");
 
-	linkwriteobj(ctxt, &b);
+	writeobj(ctxt, &b);
 	Bterm(&b);
 	close(f);
 	lastp = P;

src/cmd/8a/lex.c

@@ -177,7 +177,7 @@ assemble(char *file)
 			return nerrors;
 	}
 
-	linkwriteobj(ctxt, &obuf);
+	writeobj(ctxt, &obuf);
 	Bflush(&obuf);
 	return 0;
 }

src/cmd/8c/swt.c

@@ -244,7 +244,7 @@ outcode(void)
 	}
 	Bprint(&b, "!\n");
 
-	linkwriteobj(ctxt, &b);
+	writeobj(ctxt, &b);
 	Bterm(&b);
 	close(f);
 	lastp = P;

src/cmd/gc/obj.c

@@ -87,7 +87,7 @@ dumpobj(void)
 	ggloblsym(zero, zerosize, 1, 1);
 
 	dumpdata();
-	linkwriteobj(ctxt, bout);
+	writeobj(ctxt, bout);
 
 	if(writearchive) {
 		Bflush(bout);

src/liblink/objfile.c

@@ -114,8 +114,11 @@ static char *rdstring(Biobuf*);
 static void rddata(Biobuf*, uchar**, int*);
 static LSym *rdsym(Link*, Biobuf*, char*);
 
+// The Go and C compilers, and the assembler, call writeobj to write
+// out a Go object file.  The linker does not call this; the linker
+// does not write out object files.
 void
-linkwriteobj(Link *ctxt, Biobuf *b)
+writeobj(Link *ctxt, Biobuf *b)
 {
 	int flag;
 	Hist *h;