rustc_hir_analysis: add a helper to check function the signature mismatches

This function is now used to check `#[panic_handler]`, `start` lang item, `main`, `#[start]` and intrinsic functions.

The diagnosis produced are now closer to the ones produced by trait/impl method signature mismatch.

compiler/rustc_middle/src/traits/mod.rs

@@ -378,6 +378,9 @@ pub enum ObligationCauseCode<'tcx> {
     /// `start` has wrong type
     StartFunctionType,
 
+    /// language function has wrong type
+    LangFunctionType(Symbol),
+
     /// Intrinsic has wrong type
     IntrinsicType,