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

[Serge Pavlov via cfe-commits]

spavloff wrote:

> Tests for FP operand bundles on a non-intrinsic function would be helpful.

This patch's operand bundles are designed specifically for use with intrinsic functions, similar to constrained intrinsics. Using operand bundles with user-supplied function would require refining semantic of this use.

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