Revert "Make clang the default compiler on host."

This reverts commit 87f8b4cf0c1d6aab3eb5d1e99cc4e7cf175ef772.

Change-Id: I91a513042f0f9cf66288a296ad4a3b5da7830c7b
diff --git a/compiler/dex/verification_results.cc b/compiler/dex/verification_results.cc
index a7f67e7..6b0875c 100644
--- a/compiler/dex/verification_results.cc
+++ b/compiler/dex/verification_results.cc
@@ -30,11 +30,11 @@
 namespace art {
 
 VerificationResults::VerificationResults(const CompilerOptions* compiler_options)
-    : verified_methods_lock_("compiler verified methods lock"),
+    : compiler_options_(compiler_options),
+      verified_methods_lock_("compiler verified methods lock"),
       verified_methods_(),
       rejected_classes_lock_("compiler rejected classes lock"),
       rejected_classes_() {
-  UNUSED(compiler_options);
 }
 
 VerificationResults::~VerificationResults() {