Move casts.h and stl_util.h into base/.

Change-Id: Idb3bfa5cec3d146e488031d91265737cde2b4cf4
diff --git a/src/compiler_llvm/method_compiler.cc b/src/compiler_llvm/method_compiler.cc
index d989728..52fb02c 100644
--- a/src/compiler_llvm/method_compiler.cc
+++ b/src/compiler_llvm/method_compiler.cc
@@ -18,6 +18,7 @@
 
 #include "backend_types.h"
 #include "base/logging.h"
+#include "base/stl_util.h"
 #include "compilation_unit.h"
 #include "compiler.h"
 #include "dalvik_reg.h"
@@ -28,7 +29,6 @@
 #include "object_utils.h"
 #include "runtime_support_func.h"
 #include "runtime_support_llvm.h"
-#include "stl_util.h"
 #include "stringprintf.h"
 #include "utils_llvm.h"
 #include "verifier/method_verifier.h"