fix webgpu delay load test

[fs-eire]

Description

This change fixes the WebGPU delay load test.

The following C++ code outputs 2, 1 in MSVC, while it outputs 1, 1 in GCC:

#include <iostream>

#define A 1
#define B 1

#define ENABLE defined(A) && defined(B)

#if ENABLE
int x = 1;
#else
int x = 2;
#endif

#if defined(A) && defined(B)
int y = 1;
#else
int y = 2;
#endif

int main()
{
    std::cout << x << ", " << y << "\n";
}

Clang reports macro expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined].

Fix this by avoiding the UB.