[clang] [Clang] Replace some x86 sqrt builtins with the generic __builtin_elementwise_sqrt versions (PR #165682)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon requested changes to this pull request.

Remove out of date builtins from builtins-x86.c and update scalar test checks to use i32 instead of i64 for the element index

https://github.com/llvm/llvm-project/pull/165682