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_break.js

@@ -17,17 +17,35 @@ print("break test");
 print ("var cat");
 var cat = 'cat';
 
-function test()
+function test(x)
 {
-	print("function test");
-	foo();
-	var a = 3;
-	var b = 5;
-	var c = a + b;
-	global_var = c;
-	return c;
+  function f() {
+    return 0;
+  }
+
+  function f() {
+    /* Again. */
+    return 1;
+  }
+
+  function f() {
+    /* And again. */
+    return 2;
+  }
+
+  print("function test");
+  var a = 3;
+  var b = 5, c = a + b;
+  global_var = f();
+  return c;
+}
+
+function f() {
+  /* And again. */
 }
 
 var
-	x =
-	  1;
+  x =
+    1;
+
+test(x);