refactor(compiler): rename rec_args.* to util.*

src/compiler/CMakeLists.txt

@@ -1,2 +1,2 @@
-add_library(compiler OBJECT rec_args.cpp eta_expansion.cpp simp_pr1_rec.cpp preprocess_rec.cpp
+add_library(compiler OBJECT util.cpp eta_expansion.cpp simp_pr1_rec.cpp preprocess_rec.cpp
   init_module.cpp)

src/compiler/simp_pr1_rec.cpp

@@ -11,7 +11,7 @@ Author: Leonardo de Moura
 #include "library/replace_visitor.h"
 #include "library/constants.h"
 #include "library/util.h"
-#include "compiler/rec_args.h"
+#include "compiler/util.h"
 
 namespace lean {
 class simp_pr1_rec_fn : public replace_visitor {