errors: generate typed identifiers in each crate

Instead of loading the Fluent resources for every crate in
`rustc_error_messages`, each crate generates typed identifiers for its
own diagnostics and creates a static which are pulled together in the
`rustc_driver` crate and provided to the diagnostic emitter.

Signed-off-by: David Wood <david.wood@huawei.com>

Author: davidtwco

clippy_lints/src/doc.rs

@@ -705,7 +705,7 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
 
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
                 let fallback_bundle =
-                    rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+                    rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
                 let emitter = EmitterWriter::new(
                     Box::new(io::sink()),
                     None,

src/driver.rs

@@ -209,7 +209,7 @@ fn report_clippy_ice(info: &panic::PanicInfo<'_>, bug_report_url: &str) {
     // Separate the output with an empty line
     eprintln!();
 
-    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_errors::DEFAULT_LOCALE_RESOURCES, false);
+    let fallback_bundle = rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES, false);
     let emitter = Box::new(rustc_errors::emitter::EmitterWriter::stderr(
         rustc_errors::ColorConfig::Auto,
         None,