This PR fixes accuracy problem of aclgraph on A2. The problem is
introduced by PR #2980, which makes the `all_reduce` of shared_experts
exposed to torch dynamo. This PR moves all the codes into forward_impl
to shiled from torch dynamo.
- vLLM version: v0.10.2
- vLLM main:
17b4c6685c
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Signed-off-by: whx-sjtu <2952154980@qq.com>