gccrs: Remove param_use_canonical_types checks ported from c++ front-end

We are not fully setting TYPE_CANONICAL yet but we don't need to be as
strict as the C++ front-end yet. param_use_canonical_types is a command
line option we are not using either.

gcc/rust/ChangeLog:

	* backend/rust-tree.cc (comptypes): Remove some C++ specific checks in
	Rust const folder for now.

diff --git a/gcc/rust/backend/rust-tree.cc b/gcc/rust/backend/rust-tree.cc
index d79cd96..d2ddcfd 100644 (file)
--- a/gcc/rust/backend/rust-tree.cc
+++ b/gcc/rust/backend/rust-tree.cc
@@ -2916,27 +2916,7 @@ comptypes (tree t1, tree t2, int strict)
           perform a deep check. */
        return structural_comptypes (t1, t2, strict);
 
-      if (flag_checking && param_use_canonical_types)
-       {
-         bool result = structural_comptypes (t1, t2, strict);
-
-         if (result && TYPE_CANONICAL (t1) != TYPE_CANONICAL (t2))
-           /* The two types are structurally equivalent, but their
-              canonical types were different. This is a failure of the
-              canonical type propagation code.*/
-           internal_error (
-             "canonical types differ for identical types %qT and %qT", t1, t2);
-         else if (!result && TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2))
-           /* Two types are structurally different, but the canonical
-              types are the same. This means we were over-eager in
-              assigning canonical types. */
-           internal_error (
-             "same canonical type node for different types %qT and %qT", t1,
-             t2);
-
-         return result;
-       }
-      if (!flag_checking && param_use_canonical_types)
+      if (!flag_checking)
        return TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2);
       else
        return structural_comptypes (t1, t2, strict);