[clang] [llvm] Minimal support of floating-point operand bundles (PR #135658)

[Matt Arsenault via llvm-commits]

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@@ -56,6 +56,8 @@ Makes programs 10x faster by doing Special New Thing.
 Changes to the LLVM IR
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+* Floating-point operand bundles have been added.
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arsenm wrote:

This doesn't mean anything on its own, I think this point needs more explanation 

https://github.com/llvm/llvm-project/pull/135658