Add support for host/device stub functions for offload.

lex.ll

@@ -49,6 +49,7 @@ static void lCppComment(SourcePos *);
 static void lHandleCppHash(SourcePos *);
 static void lStringConst(YYSTYPE *, SourcePos *);
 static double lParseHexFloat(const char *ptr);
+extern void RegisterDependency(const std::string &fileName);
 
 #define YY_USER_ACTION \
     yylloc.first_line = yylloc.last_line; \
@@ -662,6 +663,7 @@ static void lHandleCppHash(SourcePos *pos) {
         ++src;
     }
     pos->name = strdup(filename.c_str());
+    RegisterDependency(filename);
 }