Improve breakpoint generator of the debugger. (#1652)

Now the debugger generates a breakpoint for each function before
its first executable statement. This allows inspecting the function
arguments. Position (line and column) info is also added which
simplifies finding of anonymus functions. Several tests were
update to check more corner cases.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/debugger/do_dump.js

@@ -16,45 +16,43 @@ print("first line of code");
 
 function f1()
 {
-	function f2()
-	{
-		return function f3() {
-			a = 4;
-			print("funciton f3");
-		};
-	}
+  function f2()
+  {
+    function g1() {
+      a = 4;
+      return print("funciton f3");
+    }
 
-	x =
-	  6;
+    function g2() { }
+  }
+
+  var
+    x =
+       6;
 }
 
-function f4() {
-	print("function f4");
+function func() {
+  'use strict';
+  'use stri' + 'ct';
 }
 
-function foo()
 {
-  print("function foo");
-  var tmp = 4;
-  f4();
+  {
+    print("Y");
+  }
 }
 
-print ("var cat");
-var cat = 'cat';
-
-function test()
-{
-	print("function test");
-	foo();
-	var a = 3;
-	var b = 5;
-	var c = a + b;
-	global_var = c;
-	return c;
-}
+;
+;
 
 var
-	x =
-	  1;
+  x =
+    1,
+  y =
+    2
 
-test();
+test = function
+(
+)
+{
+}