[llvm] [LLVM][AArch64] Allow vector converts to run in streaming mode with … (PR #177375)

[Jonathan Thackray via llvm-commits]

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jthackray wrote:

Two `if(` statements together without `{` and `}` is potentially confusing. (I'd be surprised if `git clang-format` doesn't reformat this)

https://github.com/llvm/llvm-project/pull/177375