Constant folding of bit width expressions is no longer complete

[kfcripps]

With 01fedcc, compiling the following P4 program:

header h_t {
    bit<((10 == 1 ? 1 : 10 + 1) * (8+1))> f;
}

control C() {
    action bar() {
    }

    table t {
        actions = { bar; }
        default_action = bar;
    }

    apply {
        t.apply();
    }
}

control proto();
package top(proto p);

top(C()) main;

expectedly yields:

header h_t {
    bit<99> f;
}

control C() {
    @name("C.bar") action bar() {
    }
    @name("C.t") table t_0 {
        actions = {
            bar();
        }
        default_action = bar();
    }
    apply {
        t_0.apply();
    }
}

control proto();
package top(proto p);
top(C()) main;

but 4a74084 causes it to result in an error instead:

t.p4(2): [--Werror=expected] error: *: expected a constant
    bit<((10 == 1 ? 1 : 10 + 1) * (8+1))> f;
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^