Move ir inlining tests to slow/ir_inlining, add case for bug @mwilliams found

Mark hit a bug that aravind already fixed where we didn't set
stackDeficit to zero after ending an inlined call.  Adds the repro
case and moves all the tests to slow.

hphp/test/slow/ir_inlining/collection_literal.php

@@ -0,0 +1,14 @@
+<?hh
+
+class X {
+  protected function foo(): Map<string,string>{ return Map {}; }
+  function fiz(): void {
+    $this->fuz('save', $this->foo());
+  }
+  function fuz($a, $b): void {
+    var_dump($a, $b);
+  }
+}
+
+$x = new X;
+$x->fiz();

hphp/test/slow/ir_inlining/collection_literal.php.expect

@@ -0,0 +1,3 @@
+string(4) "save"
+object(Map)#2 (0) {
+}