[ET-VK][ez] Constrain out repsets individually

[SS-JIA]

Stack from ghstack (oldest at bottom):

• [ET-VK] Re-implement (de)quantize_per_tensor.default #15721
• [ET-VK] Rename quantize/dequantize functions/shaders to be more generic #15720
• [ET-VK] Move operator specific quantize/dequantize ops to QuantizeDequantize.cpp #15707
• [ET-VK][ez] Deprecate quantized_decomposed op implementations #15706
• [ET-VK] Implementation of gather #15705
• -> [ET-VK][ez] Constrain out repsets individually #15704
• [ET-VK] Allow buffer input/output for quantize/dequantize for conv2d ops #15703
• [ET-VK][ez] Apply quantize op replacement to all argument nodes #15702

Address the TODO comment in the tag_memory_meta_pass.py graph pass.

        # TODO(ssjia): For most ops, inputs and outputs must be synchronized, so there
        # is no need to constrain output repsets explicitly. Currently, the exceptions
        # (i.e. choose qparams) already define constrined repsets for the output, so
        # there is again no need to explicitly constrain the outputs. If an operator
        # appears later on that does not sync input and output representations, and
        # defines ambiguous repsets for the output tensor(s), then we will need to add
        # additional logic to this function to constrain the output repsets separately
        # from the input repsets.

This condition is now fulfilled with the below diff.

Differential Revision: D86674164

[pytorch-bot]

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❌ 4 New Failures

As of commit 916f046 with merge base aba44fd ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest / macos / macos-job (gh)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / linux / linux-job (gh)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe
• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/recipes/test_xnnpack_recipes.py::TestXnnpackRecipes::test_int8_static_quant_recipe

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