Add crate_name method to Rustdoc and Rustc

Author: GuillaumeGomez

Diff for: src/tools/run-make-support/src/rustc.rs

@@ -176,6 +176,13 @@ impl Rustc {
         self
     }
 
+    /// Specify the crate name.
+    pub fn crate_name(&mut self, name: &str) -> &mut Self {
+        self.cmd.arg("--crate-name");
+        self.cmd.arg(name);
+        self
+    }
+
     /// Get the [`Output`][::std::process::Output] of the finished process.
     #[track_caller]
     pub fn command_output(&mut self) -> ::std::process::Output {

Diff for: src/tools/run-make-support/src/rustdoc.rs

@@ -114,6 +114,13 @@ impl Rustdoc {
         self
     }
 
+    /// Specify the crate name.
+    pub fn crate_name(&mut self, name: &str) -> &mut Self {
+        self.cmd.arg("--crate-name");
+        self.cmd.arg(name);
+        self
+    }
+
     #[track_caller]
     pub fn run_fail_assert_exit_code(&mut self, code: i32) -> Output {
         let caller_location = std::panic::Location::caller();