shader: read sample IDs from pixel ancillary input

src/graphics/shader/recompiler/backend/spirv/spirvEmitterInternal.h

@@ -43,6 +43,7 @@ enum : uint32_t {
 	CapabilityImageGatherExtended            = 25,
 	CapabilityClipDistance                   = 32,
 	CapabilityCullDistance                   = 33,
+	CapabilitySampleRateShading              = 35,
 	CapabilitySampled1D                      = 43,
 	CapabilityImage1D                        = 44,
 	CapabilityImageQuery                     = 50,
@@ -92,6 +93,7 @@ enum : uint32_t {
 	BuiltInLayer                     = 9,
 	BuiltInFragCoord                 = 15,
 	BuiltInFrontFacing               = 17,
+	BuiltInSampleId                  = 18,
 	BuiltInSampleMask                = 20,
 	BuiltInFragDepth                 = 22,
 	BuiltInWorkgroupId               = 26,