Rename compiler_llvm CompilationUnit to LlvmCompilationUnit

Also fixed stray ART_TEST_CFLAGS to LOCAL_CFLAGS
Also fixed relative includes

Tried to change CompilationUnit to reference LlvmCompilationUnit, but
that causes issues because of the split libart-compiler
libart-compiler-llvm.

Change-Id: I7a490f339add6355a20c1cedae858ccf6967a6aa
diff --git a/src/compiler/codegen/x86/codegen_x86.h b/src/compiler/codegen/x86/codegen_x86.h
index 25f4461..141638c 100644
--- a/src/compiler/codegen/x86/codegen_x86.h
+++ b/src/compiler/codegen/x86/codegen_x86.h
@@ -17,7 +17,7 @@
 #ifndef ART_SRC_COMPILER_CODEGEN_X86_CODEGENX86_H_
 #define ART_SRC_COMPILER_CODEGEN_X86_CODEGENX86_H_
 
-#include "../../compiler_internals.h"
+#include "compiler/compiler_internals.h"
 #include "x86_lir.h"
 
 namespace art {