accept some differences for rustc_abi(assert_eq), so that we can test more things to be compatible

compiler/rustc_target/src/abi/call/mod.rs

@@ -55,6 +55,28 @@ pub enum PassMode {
     Indirect { attrs: ArgAttributes, extra_attrs: Option<ArgAttributes>, on_stack: bool },
 }
 
+impl PassMode {
+    /// Checks if these two `PassMode` are equal enough to be considered "the same for all
+    /// function call ABIs".
+    pub fn eq_abi(&self, other: &Self) -> bool {
+        match (self, other) {
+            (PassMode::Ignore, PassMode::Ignore) => true, // can still be reached for the return type
+            (PassMode::Direct(a1), PassMode::Direct(a2)) => a1.eq_abi(a2),
+            (PassMode::Pair(a1, b1), PassMode::Pair(a2, b2)) => a1.eq_abi(a2) && b1.eq_abi(b2),
+            (PassMode::Cast(c1, pad1), PassMode::Cast(c2, pad2)) => c1.eq_abi(c2) && pad1 == pad2,
+            (
+                PassMode::Indirect { attrs: a1, extra_attrs: None, on_stack: s1 },
+                PassMode::Indirect { attrs: a2, extra_attrs: None, on_stack: s2 },
+            ) => a1.eq_abi(a2) && s1 == s2,
+            (
+                PassMode::Indirect { attrs: a1, extra_attrs: Some(e1), on_stack: s1 },
+                PassMode::Indirect { attrs: a2, extra_attrs: Some(e2), on_stack: s2 },
+            ) => a1.eq_abi(a2) && e1.eq_abi(e2) && s1 == s2,
+            _ => false,
+        }
+    }
+}
+
 // Hack to disable non_upper_case_globals only for the bitflags! and not for the rest
 // of this module
 pub use attr_impl::ArgAttribute;
@@ -127,6 +149,24 @@ impl ArgAttributes {
     pub fn contains(&self, attr: ArgAttribute) -> bool {
         self.regular.contains(attr)
     }
+
+    /// Checks if these two `ArgAttributes` are equal enough to be considered "the same for all
+    /// function call ABIs".
+    pub fn eq_abi(&self, other: &Self) -> bool {
+        // There's only one regular attribute that matters for the call ABI: InReg.
+        // Everything else is things like noalias, dereferenceable, nonnull, ...
+        // (This also applies to pointee_size, pointee_align.)
+        if self.regular.contains(ArgAttribute::InReg) != other.regular.contains(ArgAttribute::InReg)
+        {
+            return false;
+        }
+        // We also compare the sign extension mode -- this could let the callee make assumptions
+        // about bits that conceptually were not even passed.
+        if self.arg_ext != other.arg_ext {
+            return false;
+        }
+        return true;
+    }
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]
@@ -272,6 +312,14 @@ impl CastTarget {
                 acc.max(align)
             })
     }
+
+    /// Checks if these two `CastTarget` are equal enough to be considered "the same for all
+    /// function call ABIs".
+    pub fn eq_abi(&self, other: &Self) -> bool {
+        let CastTarget { prefix: prefix_l, rest: rest_l, attrs: attrs_l } = self;
+        let CastTarget { prefix: prefix_r, rest: rest_r, attrs: attrs_r } = other;
+        prefix_l == prefix_r && rest_l == rest_r && attrs_l.eq_abi(attrs_r)
+    }
 }
 
 /// Return value from the `homogeneous_aggregate` test function.