fix #7221, method sorting bug

Author: JeffBezanson

src/jltypes.c

@@ -2517,9 +2517,7 @@ static int jl_type_morespecific_(jl_value_t *a, jl_value_t *b, int invariant)
                 return 1;
             }
         }
-        if (!jl_is_typevar(b))
-            return 0;
-        return 1;
+        return 0;
     }
 
     if (jl_is_type_type(a) && !invariant) {

test/core.jl

@@ -2223,3 +2223,9 @@ end
 @test f10373.env.defs.next.func.code.name == :f10373
 @test g10373.env.defs.func.code.name == :g10373
 @test g10373.env.defs.next.func.code.name == :g10373
+
+# issue #7221
+f7221{T<:Number}(::T) = 1
+f7221(::BitArray) = 2
+f7221(::AbstractVecOrMat) = 3
+@test f7221(trues(1)) == 2