Inlining support in optimizing.

Currently only inlines simple things that don't require an
environment, such as:
- Returning a constant.
- Returning a parameter.
- Returning an arithmetic operation.

Change-Id: Ie844950cb44f69e104774a3cf7a8dea66bc85661
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index cd9280c..051b310 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -1373,8 +1373,7 @@
   if (resolved_method != nullptr) {
     *vtable_idx = GetResolvedMethodVTableIndex(resolved_method, orig_invoke_type);
 
-    if (enable_devirtualization) {
-      DCHECK(mUnit->GetVerifiedMethod() != nullptr);
+    if (enable_devirtualization && mUnit->GetVerifiedMethod() != nullptr) {
       const MethodReference* devirt_target = mUnit->GetVerifiedMethod()->GetDevirtTarget(dex_pc);
 
       stats_flags = IsFastInvoke(