CoreML fails to lower asinh/acosh

[GregoryComer]

🐛 Describe the bug

Models that contain torch.asinh or torch.acosh will error out with an internal error inside the CoreML lowering code.

Repro:

## import torch

from executorch.backends.apple.coreml.partition import CoreMLPartitioner
from executorch.exir import to_edge_transform_and_lower, EdgeCompileConfig, to_edge
from executorch.extension.pybindings.portable_lib import _load_for_executorch_from_buffer

class Model(torch.nn.Module):
    def __init__(self):
        super().__init__()
        
    def forward(self, x):
        return torch.acosh(x)

model = Model()
inputs = (
    torch.randn(1,64),
)

eager_outputs = model(*inputs)
#print(f"Eager: {eager_outputs.shape} {eager_outputs}")

ep = torch.export.export(model.eval(), inputs)
print(ep)

print(f"EP: {ep.module()(*inputs)}")

lowered = to_edge_transform_and_lower(
    ep,
    partitioner=[CoreMLPartitioner()],
    compile_config=EdgeCompileConfig(_check_ir_validity=False)
).to_executorch()

print(lowered.exported_program())

et_model = _load_for_executorch_from_buffer(lowered.buffer)
et_outputs = et_model([*inputs])[0]

et_outputs - eager_outputs

Output:

File [~/miniconda3/envs/executorch/lib/python3.10/site-packages/coremltools/converters/mil/frontend/torch/ops.py:6834](http://localhost:8888/lab/tree/~/miniconda3/envs/executorch/lib/python3.10/site-packages/coremltools/converters/mil/frontend/torch/ops.py#line=6833), in acosh(context, node)
   6831 @register_torch_op
   6832 def acosh(context, node):
   6833     inputs = _get_inputs(context, node, expected=1)
-> 6834     context.add(mb.acosh(x=inputs[0], name=node.name))

AttributeError: type object 'Builder' has no attribute 'acosh'

Versions

coremltools version 8.3
executorch commit 67b6009 (Jun 14)

cc @kimishpatel @YifanShenSZ @cymbalrush @metascroy