module: fix --debug-brk on symlinked scripts

* fixes #1519

lib/module.js

@@ -358,6 +358,11 @@ Module.prototype.require = function(path) {
 };
 
 
+// Resolved path to process.argv[1] will be lazily placed here
+// (needed for setting breakpoint when called with --debug-brk)
+var resolvedArgv;
+
+
 // Returns exception if any
 Module.prototype._compile = function(content, filename) {
   var self = this;
@@ -425,9 +430,16 @@ Module.prototype._compile = function(content, filename) {
   var wrapper = Module.wrap(content);
 
   var compiledWrapper = runInThisContext(wrapper, filename, true);
-  if (filename === process.argv[1] && global.v8debug) {
+  if (global.v8debug) {
+    if (!resolvedArgv) {
+      resolvedArgv = Module._resolveFilename(process.argv[1], null)[1];
+    }
+
+    // Set breakpoint on module start
+    if (filename === resolvedArgv) {
       global.v8debug.Debug.setBreakPoint(compiledWrapper, 0, 0);
     }
+  }
   var args = [self.exports, require, self, filename, dirname];
   return compiledWrapper.apply(self.exports, args);
 };