Rename OatCompilationUnit to Dex.. move to compiler.

Some other clean-up to make fields const and private.

Change-Id: Icad66e2969385ab1f4125162bcbf8d5fa92d3ed5
diff --git a/src/compiler_llvm/compiler_llvm.h b/src/compiler_llvm/compiler_llvm.h
index 0995a55..0470f29 100644
--- a/src/compiler_llvm/compiler_llvm.h
+++ b/src/compiler_llvm/compiler_llvm.h
@@ -34,7 +34,7 @@
   class CompiledInvokeStub;
   class CompiledMethod;
   class CompilerDriver;
-  class OatCompilationUnit;
+  class DexCompilationUnit;
   namespace mirror {
     class AbstractMethod;
     class ClassLoader;
@@ -76,12 +76,12 @@
     bitcode_filename_ = filename;
   }
 
-  CompiledMethod* CompileDexMethod(OatCompilationUnit* oat_compilation_unit,
+  CompiledMethod* CompileDexMethod(DexCompilationUnit* dex_compilation_unit,
                                    InvokeType invoke_type);
 
-  CompiledMethod* CompileGBCMethod(OatCompilationUnit* oat_compilation_unit, std::string* func);
+  CompiledMethod* CompileGBCMethod(DexCompilationUnit* dex_compilation_unit, std::string* func);
 
-  CompiledMethod* CompileNativeMethod(OatCompilationUnit* oat_compilation_unit);
+  CompiledMethod* CompileNativeMethod(DexCompilationUnit* dex_compilation_unit);
 
   CompiledInvokeStub* CreateInvokeStub(bool is_static, const char *shorty);