Add bounds checking on buffer_idx for constant_buffer and constant_data in XNNPACK #2262

Job	Run time
test-coreml / test-backend-macos (coreml, models) / macos-job	1m 8s
test-coreml / test-backend-macos (coreml, operators) / macos-job	36s
test-coreml / test-backend-linux	-1s
test-coreml / package-golden-artifacts	-1s
	1m 42s

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