[llvm] [IR][AArch64] Add llvm.masked.speculative.load intrinsic (PR #156470)

[David Sherwood via llvm-commits]

https://github.com/david-arm commented:

It might be a good idea to split this patch up into two parts:

1. A patch to introduce the LangRef and intrinsic along with the scalarisation code (on by default for all targets).
2. A follow-on patch to add the TTI hook and the codegen.

What do you think?

https://github.com/llvm/llvm-project/pull/156470