Integrate LLVM to llvm/llvm-project@480b2c9eb47f (#24793)

Bumpy `llvm-project` from `8c5193b41f2f` to `480b2c9eb47f`, no
carried-over or new reverts.

One adaptation was required:

llvm/llvm-project@9e43e04108dd stops arith-expand from expanding
`arith.maximumf/minimumf/maxnumf/minnumf` unless the new
`include-min-max-f` option is set. For VMVX, `ArithToVM` has conversion
patterns for `arith.maximumf/minimumf` but none for
`arith.maxnumf/minnumf`, so the `arith.maxnumf` emitted by the
`linalg.softmax` decomposition no longer legalized and `VMVX -> VM`
conversion failed in `tests/e2e/linalg/softmax.mlir`.

Setting `includeMinMaxF` on the VMVX arith-expand invocation restores
the previous behavior. `include-min-max-i` is left off because the VM
dialect has native integer min/max ops for both i32 and i64.

LLVMCPU has direct lowerings to the `llvm.intr.maximum/maxnum`.

Assisted-by: Claude Code and reviewed by me.

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Signed-off-by: Ege Beysel <beysel@roofline.ai>