Fix bswap intrinsic error location

When bswap is used with an incorrect type, print the location of the
call site, not the declaration.

Fixes #4465.

gcc/rust/ChangeLog:

	* backend/rust-intrinsic-handlers.cc: use call site error
	location instead of the declaration location

gcc/testsuite/ChangeLog:

	* rust/compile/bswap.rs: update error location

Signed-off-by: Jean-Christian CÎRSTEA <jean-christian.cirstea@tuta.com>

Author: Jean-Christian-Cirstea

gcc/rust/backend/rust-intrinsic-handlers.cc

@@ -80,7 +80,7 @@ check_for_basic_integer_type (const std::string &intrinsic_str,
     {
       rust_error_at (
 	locus,
-	"%s intrinsics can only be used with basic integer types (got %qs)",
+	"%s intrinsic can only be used with basic integer types (got %qs)",
 	intrinsic_str.c_str (), type->get_name ().c_str ());
     }
 
@@ -1397,8 +1397,8 @@ bswap_handler (Context *ctx, TyTy::FnType *fntype)
   auto *monomorphized_type
     = fntype->get_substs ().at (0).get_param_ty ()->resolve ();
 
-  check_for_basic_integer_type ("bswap", fntype->get_locus (),
-				monomorphized_type);
+  auto call_locus = ctx->get_mappings ().lookup_location (fntype->get_ref ());
+  check_for_basic_integer_type ("bswap", call_locus, monomorphized_type);
 
   tree template_parameter_type
     = TyTyResolveCompile::compile (ctx, monomorphized_type);

gcc/testsuite/rust/compile/bswap.rs

@@ -9,9 +9,9 @@ pub trait Sized {}
 pub trait Copy {}
 
 extern "rust-intrinsic" {
-    pub fn bswap<T>(x: T) -> T; // { dg-error "bswap intrinsics can only be used with basic integer types .got 'bool'." }
+    pub fn bswap<T>(x: T) -> T; 
 }
 
 fn main() {
-    let _ = bswap(true);
+    let _ = bswap(true); // { dg-error "bswap intrinsics can only be used with basic integer types .got 'bool'." }
 }