[llvm] [IR] Allow nofree metadata to inttoptr (PR #153149)

[Jay Foad via llvm-commits]

jayfoad wrote:

> This brings back the expected behavior of instruction hoisting for the test `hoist-speculatable-load.ll`, which was broken by #126117.

See also https://github.com/llvm/llvm-project/pull/126117#discussion_r2213212078 - I don't think #126117 really _needs_ `nofree`.

https://github.com/llvm/llvm-project/pull/153149