Move compiler_llvm to art::llvm.

Also move the invoke stubs (soon to be removed) under compiler.
Start moving LLVM code under compiler. Will move GBC expander to dex/portable
once it is disentangled from other builds (moving toward solving Bug: 8195425).

Change-Id: I8829f9db6ade9ac8e32bd16198b90f83619769f1
diff --git a/src/compiler/llvm/utils_llvm.h b/src/compiler/llvm/utils_llvm.h
new file mode 100644
index 0000000..e06e113
--- /dev/null
+++ b/src/compiler/llvm/utils_llvm.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2011 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_SRC_UTILS_LLVM_H_
+#define ART_SRC_UTILS_LLVM_H_
+
+#include "base/stringprintf.h"
+
+#include <llvm/Analysis/Verifier.h>
+
+#include <stdint.h>
+#include <string>
+
+namespace art {
+
+#ifndef NDEBUG
+#define VERIFY_LLVM_FUNCTION(func) ::llvm::verifyFunction(func, ::llvm::AbortProcessAction)
+#else
+#define VERIFY_LLVM_FUNCTION(func)
+#endif
+
+inline static std::string ElfFuncName(uint32_t idx) {
+  return StringPrintf("Art%u", static_cast<unsigned int>(idx));
+}
+
+class CStringLessThanComparator {
+ public:
+  bool operator()(const char* lhs, const char* rhs) const {
+    return (strcmp(lhs, rhs) < 0);
+  }
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_UTILS_LLVM_H_