ART: Some Quick cleanup

Make several fields const in CompilationUnit. May benefit some Mir2Lir
code that repeats tests, and in general immutability is good.

Remove compiler_internals.h and refactor some other headers to reduce
overly broad imports (and thus forced recompiles on changes).

Change-Id: I898405907c68923581373b5981d8a85d2e5d185a
diff --git a/compiler/dex/dex_flags.h b/compiler/dex/dex_flags.h
new file mode 100644
index 0000000..eaf272b
--- /dev/null
+++ b/compiler/dex/dex_flags.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_DEX_DEX_FLAGS_H_
+#define ART_COMPILER_DEX_DEX_FLAGS_H_
+
+namespace art {
+
+// Suppress optimization if corresponding bit set.
+enum OptControlVector {
+  kLoadStoreElimination = 0,
+  kLoadHoisting,
+  kSuppressLoads,
+  kNullCheckElimination,
+  kClassInitCheckElimination,
+  kGlobalValueNumbering,
+  kLocalValueNumbering,
+  kPromoteRegs,
+  kTrackLiveTemps,
+  kSafeOptimizations,
+  kBBOpt,
+  kSuspendCheckElimination,
+  kMatch,
+  kPromoteCompilerTemps,
+  kBranchFusing,
+  kSuppressExceptionEdges,
+  kSuppressMethodInlining,
+};
+
+// Force code generation paths for testing.
+enum DebugControlVector {
+  kDebugVerbose,
+  kDebugDumpCFG,
+  kDebugSlowFieldPath,
+  kDebugSlowInvokePath,
+  kDebugSlowStringPath,
+  kDebugSlowTypePath,
+  kDebugSlowestFieldPath,
+  kDebugSlowestStringPath,
+  kDebugExerciseResolveMethod,
+  kDebugVerifyDataflow,
+  kDebugShowMemoryUsage,
+  kDebugShowNops,
+  kDebugCountOpcodes,
+  kDebugDumpCheckStats,
+  kDebugShowSummaryMemoryUsage,
+  kDebugShowFilterStats,
+  kDebugTimings,
+  kDebugCodegenDump
+};
+
+}  // namespace art
+
+#endif  // ART_COMPILER_DEX_DEX_FLAGS_H_