Two new Vulkan specific intrinsic resource types, SubpassInput and
SubpassInputMS, are introduced to provide a way to use subpass inputs
in Vulkan. Their signatures:
template<typename T>
class SubpassInput {
T SubpassLoad();
};
template<typename T>
class SubpassInputMS {
T SubpassLoad(int sample);
};
T can be a scalar or vector type.
If compiled without ENABLE_SPIRV_CODEGEN, the compiler will report
unknown type name for SubpassInput(MS). If compiled with SPIR-V
CodeGen and trying to use SubpassInput(MS) in DXIL CodeGen, the
compiler will report an error saying the type is Vulkan-specific.
A new Vulkan-specific attribute, vk::input_attachment_index is
introduced to provide a way to set the input attachment index for
SubpassInput(MS) objects.
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