将着色器完全加载到 ShaderVariantCollection 中。
通常，首次需要着色器时，图形驱动程序才会实际准备着色器。
但是，首次使用先前未使用过的着色器渲染某个对象时，
可能会出现暂时性中断，因为驱动程序需要编译/优化该着色器。这可能会非常
明显，尤其是在移动平台上。
调用此函数将为此 ShaderVariantCollection 中的着色器及其变体执行虚拟
one-invisible-triangle 渲染。您可以设置为在游戏加载
期间自动执行此操作（在 Graphics Settings 中），或者在适当时（例如在加载新关卡时）
手动调用此函数。
对已经预热的 ShaderVariantCollection 调用 WarmUp 将不执行任何操作。
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