add some tests (see #2996)

tests/misc/projects/Issue2996/Main.hx

@@ -0,0 +1,5 @@
+import haxe.macro.Expr;
+
+class Main {
+
+}

tests/misc/projects/Issue2996/compile1.hxml

@@ -0,0 +1 @@
+--display Main.hx@0@resolve@Std

tests/misc/projects/Issue2996/compile1.hxml.stderr

@@ -0,0 +1,3 @@
+<list>
+<pos>c:\github\haxe\std\std.hx:29: characters 7-12</pos>
+</list>

tests/misc/projects/Issue2996/compile2.hxml

@@ -0,0 +1 @@
+--display Main.hx@0@resolve@ExprDef

tests/misc/projects/Issue2996/compile2.hxml.stderr

@@ -0,0 +1,3 @@
+<list>
+<pos>c:\github\haxe\std\haxe\macro\expr.hx:197: lines 197-228</pos>
+</list>