[clang] Honor pragmas with -ffp-contract=fast, depecate fast-honor-pragmas (PR #105746)

[Pratyay Pande via cfe-commits]

pratyay-p wrote:

Hello @andykaylor ,

I am working on this pragma operation, with a different scenario. For example: https://godbolt.org/z/nTfYW64j4

Is it ok to merge this patch?

https://github.com/llvm/llvm-project/pull/105746