Limit depth of inlining for --stress-opt runs to avoid going into infinite recursion.

src/hydrogen.cc

Index: src/hydrogen.cc
===================================================================
--- src/hydrogen.cc	(revision 9462)
+++ src/hydrogen.cc	(working copy)
@@ -4559,7 +4559,9 @@
   HEnvironment* env = environment();
   int current_level = 1;
   while (env->outer() != NULL) {
-    if (FLAG_limit_inlining && current_level == Compiler::kMaxInliningLevels) {
+    if (current_level == (FLAG_limit_inlining
+                          ? Compiler::kMaxInliningLevels
+                          : 2 * Compiler::kMaxInliningLevels)) {
       TraceInline(target, caller, "inline depth limit reached");
       return false;
     }