Fix assertion failure

reproduces if building Three.js 10 times in runtime

src/sourcemap/sourcemap.zig

@@ -698,7 +698,7 @@ pub const LineOffsetTable = struct {
             if (c > 0x7F and columns_for_non_ascii.items.len == 0) {
                 std.debug.assert(@ptrToInt(
                     remaining.ptr,
-                ) > @ptrToInt(
+                ) >= @ptrToInt(
                     contents.ptr,
                 ));
                 // we have a non-ASCII character, so we need to keep track of the