[llvm] [TableGen] Reduce the number of vectors passed to getIslands. NFC (PR #130402)

[Rahul Joshi via llvm-commits]

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@@ -516,10 +522,7 @@ class FilterChooser {
   // This returns a lit of undecoded bits of an instructions, for example,
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jurahul wrote:

nit: list of instead if lit of? I know this PR is not touching it, but can you please fix the typo?

https://github.com/llvm/llvm-project/pull/130402