Move Compiler to own module.

Author: ibuclaw

src/dmd/compiler.d

@@ -0,0 +1,16 @@
+/**
+ * Compiler implementation of the
+ * $(LINK2 http://www.dlang.org, D programming language).
+ *
+ * Copyright:   Copyright (c) 1999-2017 by The D Language Foundation, All Rights Reserved
+ * Authors:     $(LINK2 http://www.digitalmars.com, Walter Bright)
+ * License:     $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
+ * Source:      $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/compiler.d, _compiler.d)
+ */
+
+module dmd.compiler;
+
+struct Compiler
+{
+    const(char)* vendor; // Compiler backend name
+}

src/dmd/globals.d

@@ -19,6 +19,7 @@ import core.stdc.stdio;
 import dmd.root.array;
 import dmd.root.filename;
 import dmd.root.outbuffer;
+import dmd.compiler;
 import dmd.identifier;
 
 template xversion(string s)
@@ -215,11 +216,6 @@ struct Param
     const(char)* mapfile;
 }
 
-struct Compiler
-{
-    const(char)* vendor; // Compiler backend name
-}
-
 alias structalign_t = uint;
 
 // magic value means "match whatever the underlying C compiler does"