[quant][graphmode][fx] Quantize the output of statically quantized fp16 op in QuantizeHandler (#58445)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58445
Previously the output of statically quantized fp16 operator is not quantized in QuantizeHandler, which is not consistent with
the behavior of static int8 operators. Also it does not work well with reference functions, this PR
changes the fp16 static QuantizeHandler to quantize (call to(torch.float16)) in the QuantizeHandler, this also
makes the future support for reference functions easier.
Test Plan:
python test/test_quantization.py TestQuantizeFx
python test/test_quantization.py TestQuantizeFxOps
Imported from OSS
Reviewed By: vkuzo
Differential Revision: D28495830
fbshipit-source-id: 2140eab8ab2dd08f6570d9e305485e3029e1f47d
