Add int16 support to RELU #4418

Job	Run time
no-labels	1s
ci-ready-to-merge	3s
ci-run	1s
ci-run-full	3s
call-ci / Bazel (presubmit)	16m 58s
call-ci / Bazel TFLite Tools (presubmit)	1m 46s
call-ci / Bazel asan (presubmit)	14m 52s
call-ci / Bazel msan (presubmit)	14m 20s
call-ci / Cortex-M Bluepill No Release (presubmit)	8m 9s
call-ci / Cortex-M Bluepill Release (presubmit)	6m 58s
call-ci / Cortex-M QEMU Unit Tests (presubmit)	6m 56s
call-ci / Code Style (presubmit)	1m 8s
call-ci / Cortex-M Bluepill Renode (presubmit)	4m 17s
call-ci / Project Generation (presubmit)	9m 32s
call-ci / Makefile x86 Default (presubmit)	6m 58s
call-ci / Makefile x86 Release (presubmit)	11m 52s
call-check-tflite-files / Check PR Modifies TfLite Files	36s
call-ci / Makefile x86 No TFLite Static Memory (presubmit)	5m 47s
call-ci / Makefile x86 Out Of Tree (presubmit)	3m 31s
call-xtensa-presubmit / Hifi5 Unit Tests (presubmit)	19m 23s
call-hexagon / Hexagon Build Test (presubmit)	8m 33s
call-xtensa-presubmit / Vision P6 Build (presubmit)	11m 44s
call-xtensa-presubmit / Hifi3z Unit Tests (presubmit)	22m 57s
PR has Bug	1s
	2h 56m 26s

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