remove BindgenState from dump_preprocessed_input

Author: pvdrz

src/lib.rs

@@ -1549,8 +1549,6 @@ impl Builder {
     /// issues. The resulting file will be named something like `__bindgen.i` or
     /// `__bindgen.ii`
     pub fn dump_preprocessed_input(&self) -> io::Result<()> {
-        let state = BindgenState::build(&self.options);
-
         let clang =
             clang_sys::support::Clang::find(None, &[]).ok_or_else(|| {
                 io::Error::new(
@@ -1564,7 +1562,7 @@ impl Builder {
         let mut wrapper_contents = String::new();
 
         // Whether we are working with C or C++ inputs.
-        let mut is_cpp = args_are_cpp(&state.clang_args);
+        let mut is_cpp = args_are_cpp(&self.options.clang_args);
 
         // For each input header, add `#include "$header"`.
         for header in &self.options.input_headers {
@@ -1605,7 +1603,7 @@ impl Builder {
             .arg(&wrapper_path)
             .stdout(Stdio::piped());
 
-        for a in &state.clang_args {
+        for a in &self.options.clang_args {
             cmd.arg(a);
         }