[clang] [clang][bytecode] Implement bitcasts to floating-point values (PR #114485)

[Rainer Orth via cfe-commits]

rorth wrote:

This broke the [Solaris/sparcv9 bot](https://lab.llvm.org/buildbot/#/builders/13/builds/3268).

https://github.com/llvm/llvm-project/pull/114485