Add regression test for macros with multi-line comments

Check that multi-line comments are supported in macros.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

ivtest/ivltests/macro_comment_multiline.v

@@ -0,0 +1,23 @@
+// Check that multi-line comments in macros are supported. Including some corner
+// cases like another comment start in the comment.
+
+`define test(a, b, c) \
+  (a + /* these is some \
+   multi line */ b /* comment \
+   that goes on \
+   and on */ ) /* and some more \
+\
+   // and even has a comments \
+   /* in the comment */ * c
+
+module test;
+
+  initial begin
+    if (`test(1, 2, 3) === 9) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule

ivtest/regress-vlg.list

@@ -638,6 +638,7 @@ macro_args		CO,-yivltests			ivltests
 macro_comment1		normal			ivltests
 macro_comment2		normal			ivltests
 macro_comment3		normal			ivltests
+macro_comment_multiline	normal			ivltests
 macro_redefinition	normal,-Wmacro-redefinition	ivltests gold=macro_redefinition.gold
 macro_replacement	normal,-Wmacro-replacement	ivltests gold=macro_replacement.gold
 macsub			normal			ivltests