…no epilogue_nodes

ghstack-source-id: 0a118d8
Pull Request resolved: #136518

…no epilogue_nodes (pytorch#136518)

The `template_buffer_has_other_users` function checks the case where there're epilogue nodes and the template output has users other than these epilogue nodes.  When there's no epilogue nodes, the function could return `False` directly.

Pull Request resolved: pytorch#136518
Approved by: https://github.com/leslie-fang-intel, https://github.com/jgong5
ghstack dependencies: pytorch#136418

Fixes the max-autotune failure of `soft_actor_critic` of Torchbench in FP32 single thread dynamic shape case:
```log
  File "/home/user/inductor/pytorch/torch/_inductor/codegen/cpp_micro_gemm.py", line 136, in codegen_call
    C_ptr = f"&({kernel.index(C, [0, 0])})"
  File "/home/user/inductor/pytorch/torch/_inductor/codegen/cpp_template_kernel.py", line 135, in index
    else self.args.input(node.get_name())
  File "/home/user/inductor/pytorch/torch/_inductor/codegen/common.py", line 1251, in input
    assert name not in V.graph.removed_buffers, name
AssertionError: buf_GemmOut
```

The 1st and 2nd linear does not need to use local buffer while the 3rd linear needs to use local buffer.
The 3rd linear which uses local buffer will add its global buffer (named as `buf_GemmOut`) into `V.graph.removed_buffers`.

When scheduling the nodes, the 1st linear (won't use local buffer) will get its output buffer (also named as `buf_GemmOut`) from the input and found that it's in the `V.graph.removed_buffers` and raise AssertionError. The issue is that the output buffer of all these linears are all names with `buf_GemmOut`, which have a conflict.

Rename these buffers by adding the name of the `template_buffer` as the prefix.

Pull Request resolved: #136419
Approved by: https://github.com/leslie-fang-intel, https://github.com/jgong5
ghstack dependencies: #136418, #136518