Mark concrete HIR instructions as FINAL.

This allows the compiler to apply more optimizations.

Change-Id: Ic7d8a457ea4e7d5853195cc4b56482703a1176d5
diff --git a/compiler/optimizing/nodes_arm.h b/compiler/optimizing/nodes_arm.h
index 6a1dbb9..371e8ef 100644
--- a/compiler/optimizing/nodes_arm.h
+++ b/compiler/optimizing/nodes_arm.h
@@ -19,7 +19,7 @@
 
 namespace art {
 
-class HArmDexCacheArraysBase : public HExpression<0> {
+class HArmDexCacheArraysBase FINAL : public HExpression<0> {
  public:
   explicit HArmDexCacheArraysBase(const DexFile& dex_file)
       : HExpression(Primitive::kPrimInt, SideEffects::None(), kNoDexPc),