完全加载所有着色器，以防未来性能中断。
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。
调用此函数将使用当前加载的所有着色器的所有变体执行虚拟 one-invisible-triangle
渲染。这可能需要一些时间，但有助于
避免未来出现暂时性中断。一般最好使用 ShaderVariantCollection 实现更精细的
着色器预热控制。
请注意，此函数仅预热当前加载（显式或通过对使用自定义着色器的预制件的引用）的着色器。
如果使用 Resources.Load 加载着色器，则需要再次调用 WarmupAllShaders。
另请参阅：ShaderVariantCollection，了解更精细的着色器预热控制。
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