Enable these tests. Fix divconst.go and modconst.go to

compile with the current compiler.  Adjust expected error
message in method1.go to match 6g output.

R=rsc
DELTA=9  (2 added, 5 deleted, 2 changed)
OCL=33674
CL=33682

test/ken/divconst.go

@@ -458,8 +458,6 @@ u8run()
 	}
 }
 
-func	xtest()
-
 func
 main()
 {

test/ken/modconst.go

@@ -458,8 +458,6 @@ u8run()
 	}
 }
 
-func	xtest()
-
 func
 main()
 {

test/method1.go

@@ -1,4 +1,4 @@
-// # errchk $G $D/$F.go
+// errchk $G $D/$F.go
 
 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
@@ -14,5 +14,4 @@ func f(int, string);	// GCCGO_ERROR "previous"
 func f(int, float) { }  // ERROR "redeclared|redefinition"
 
 func g(a int, b string);  // GCCGO_ERROR "previous"
-func g(a int, c string);  // ERROR "names changed"
-
+func g(a int, c string);  // ERROR "redeclared|redefinition"