Optimize OatWriter when we don't compile any method.

- Don't write any quickening info.
- Don't visit methods.

Saves ~20% of compilation times.

Test: test-art-host

Change-Id: Ib18fd06c0ca42308e1d81401de0ee3e6297de0ce
diff --git a/compiler/driver/compiler_options.h b/compiler/driver/compiler_options.h
index 9c62f80..6894cd5 100644
--- a/compiler/driver/compiler_options.h
+++ b/compiler/driver/compiler_options.h
@@ -109,7 +109,7 @@
     return CompilerFilter::IsVerificationEnabled(compiler_filter_);
   }
 
-  bool NeverVerify() const {
+  bool AssumeClassesAreVerified() const {
     return compiler_filter_ == CompilerFilter::kVerifyNone;
   }
 
@@ -117,6 +117,10 @@
     return compiler_filter_ == CompilerFilter::kVerifyProfile;
   }
 
+  bool IsAnyMethodCompilationEnabled() const {
+    return CompilerFilter::IsAnyMethodCompilationEnabled(compiler_filter_);
+  }
+
   size_t GetHugeMethodThreshold() const {
     return huge_method_threshold_;
   }