Change the numbering of static ctors/dtors to be module based instead of being global.

This fixes #210 by making sure that the static ctor always gets the same
number, regardless of the order of the modules given at the command line.

dmd/module.c

@@ -130,6 +130,7 @@ Module::Module(char *filename, Identifier *ident, int doDocComment, int doHdrGen
     llvmForceLogging = false;
     this->doDocComment = doDocComment;
     this->doHdrGen = doHdrGen;
+    uniqueId = 0;
 }
 
 File* Module::buildFilePath(char* forcename, char* path, char* ext)
@@ -1007,3 +1008,8 @@ DsymbolTable *Package::resolve(Array *packages, Dsymbol **pparent, Package **ppk
     }
     return dst;
 }
+
+Identifier* Module::generateId(Identifier* id)
+{
+    return Identifier::generateId(id->string, uniqueId++);
+}