Use jl_types_egal in equiv_field_types (#52748)

Fixes #52686
Fixes timholy/Revise.jl#770

---------

Co-authored-by: Jameson Nash <vtjnash@gmail.com>
Co-authored-by: Kristoffer Carlsson <kcarlsson89@gmail.com>
Co-authored-by: Shuhei Kadowaki <40514306+aviatesk@users.noreply.github.com>

src/builtins.c

@@ -1678,7 +1678,7 @@ static int equiv_field_types(jl_value_t *old, jl_value_t *ft)
         jl_value_t *ta = jl_svecref(old, i);
         jl_value_t *tb = jl_svecref(ft, i);
         if (jl_has_free_typevars(ta)) {
-            if (!jl_has_free_typevars(tb) || !jl_egal(ta, tb))
+            if (!jl_has_free_typevars(tb) || !jl_types_egal(ta, tb))
                 return 0;
         }
         else if (jl_has_free_typevars(tb) || jl_typetagof(ta) != jl_typetagof(tb) ||

test/core.jl

@@ -107,6 +107,21 @@ let abcd = ABCDconst(1, 2, 3, 4)
         abcd.d = nothing)
     @test (1, 2, "not constant", 4) === (abcd.a, abcd.b, abcd.c, abcd.d)
 end
+# Issue #52686
+struct A52686{T} end
+struct B52686{T, S}
+    a::A52686{<:T}
+end
+function func52686()
+    @eval begin
+        struct A52686{T} end
+        struct B52686{T, S}
+            a::A52686{<:T}
+        end
+    end
+    return true
+end
+@test func52686()
 
 # test `===` handling null pointer in struct #44712
 struct N44712