Fix memory leak in CommonCompilerTest::CompileMethod().

And enforce that we successfully compile the method.

This fixes ASAN tests broken by
    https://android-review.googlesource.com/919053

Test: run_build_test_target.py art-gtest-heap-poisoning
Change-Id: I98b6c11e097bd9aea6605f3b77b1bcbb2206dbd0
diff --git a/compiler/common_compiler_test.cc b/compiler/common_compiler_test.cc
index d59cb17..a44b9ae 100644
--- a/compiler/common_compiler_test.cc
+++ b/compiler/common_compiler_test.cc
@@ -173,7 +173,7 @@
   TimingLogger timings("CommonCompilerTest::CompileMethod", false, false);
   TimingLogger::ScopedTiming t(__FUNCTION__, &timings);
   CompiledMethodStorage storage(/*swap_fd=*/ -1);
-  const CompiledMethod* compiled_method = nullptr;
+  CompiledMethod* compiled_method = nullptr;
   {
     DCHECK(!Runtime::Current()->IsStarted());
     Thread* self = Thread::Current();
@@ -204,8 +204,12 @@
     }
     compiler_options_->verification_results_ = nullptr;
   }
-  TimingLogger::ScopedTiming t2("MakeExecutable", &timings);
-  MakeExecutable(method, compiled_method);
+  CHECK(method != nullptr);
+  {
+    TimingLogger::ScopedTiming t2("MakeExecutable", &timings);
+    MakeExecutable(method, compiled_method);
+  }
+  CompiledMethod::ReleaseSwapAllocatedCompiledMethod(&storage, compiled_method);
 }
 
 void CommonCompilerTest::CompileDirectMethod(Handle<mirror::ClassLoader> class_loader,