Run example llama2 model with fp16

[digantdesai]

Summary:
FYI - there are hardcoded float in rmsnorm which makes bunch of nodes in the graph as fp32.

aten_embedding_default: "f16[1, 3, 64]" = executorch_exir_dialects_edge__ops_aten_embedding_default(arg11_1, arg55_1);  arg11_1 = arg55_1 = None
            aten_slice_copy_tensor: "f16[3, 4]" = executorch_exir_dialects_edge__ops_aten_slice_copy_Tensor(arg48_1, 0, 0, 3);  arg48_1 = None
            aten_slice_copy_tensor_1: "f16[3, 4]" = executorch_exir_dialects_edge__ops_aten_slice_copy_Tensor(arg49_1, 0, 0, 3);  arg49_1 = None
            aten__to_copy_default: "f32[1, 3, 64]" = executorch_exir_dialects_edge__ops_aten__to_copy_default(aten_embedding_default, dtype = torch.float32)

Copy from - https://www.internalfb.com/code/fbsource/%5B7e45e7bcd969%5D/xplat/executorch/examples/models/llama2/model.py?lines=78

Differential Revision: D53596500

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As of commit 829d304 with merge base 0ea44aa ():

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• pull / test-models-linux (cmake, mv2, portable, linux.2xlarge, 90) / linux-job (gh)
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• pull / test-selective-build-linux (cmake) / linux-job (gh)
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  exir/backend/test/test_debug_handle_map.py::TestBackendDebugHandle::test_lowered_the_whole_model
• pull / unittest / macos (buck2) / macos-job (gh)
  exir/backend/test/test_debug_handle_map.py::TestBackendDebugHandle::test_lowered_the_whole_model

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This pull request was exported from Phabricator. Differential Revision: D53596500

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This pull request has been merged in eb50c46.