verilog: fix sizing of ports with int types in module headers

Declaring the ports as standard module items already worked as expected.
This adds a missing usage of `checkRange()` so that headers such as
`module m(output integer x);` now work correctly.

tests/verilog/port_int_types.sv

@@ -0,0 +1,50 @@
+`define INITS \
+    assign a = -1; \
+    assign b = -2; \
+    assign c = -3; \
+    assign d = -4; \
+    assign a_ext = a; \
+    assign b_ext = b; \
+    assign c_ext = c; \
+    assign d_ext = d;
+
+module gate_a(
+    output byte a,
+    output byte unsigned b,
+    output shortint c,
+    output shortint unsigned d,
+    output [31:0] a_ext,
+    output [31:0] b_ext,
+    output [31:0] c_ext,
+    output [31:0] d_ext
+);
+    `INITS
+endmodule
+
+module gate_b(
+    a, b, c, d,
+    a_ext, b_ext, c_ext, d_ext
+);
+    output byte a;
+    output byte unsigned b;
+    output shortint c;
+    output shortint unsigned d;
+    output [31:0] a_ext;
+    output [31:0] b_ext;
+    output [31:0] c_ext;
+    output [31:0] d_ext;
+    `INITS
+endmodule
+
+module gold(
+    output signed [7:0] a,
+    output unsigned [7:0] b,
+    output signed [15:0] c,
+    output unsigned [15:0] d,
+    output [31:0] a_ext,
+    output [31:0] b_ext,
+    output [31:0] c_ext,
+    output [31:0] d_ext
+);
+    `INITS
+endmodule

tests/verilog/port_int_types.ys

@@ -0,0 +1,11 @@
+read_verilog -sv port_int_types.sv
+equiv_make gold gate_a equiv
+equiv_simple
+equiv_status -assert
+
+design -reset
+
+read_verilog -sv port_int_types.sv
+equiv_make gold gate_b equiv
+equiv_simple
+equiv_status -assert