[clang] clang/OpenCL: set sqrt fp accuracy on call to Z4sqrt (PR #66651)

[via cfe-commits]

alan-baker wrote:

This is preferable to defining the function in the OpenCL headers (as was noted in the original PR). To me, the important part is covering the OpenCL use case. So if we want to only check the overloads OpenCL generates I think that would be ok, but I expect this generic implementation is sufficient.

https://github.com/llvm/llvm-project/pull/66651