[libc] [clang-tools-extra] [lldb] [flang] [mlir] [llvm] [clang] [compiler-rt] [libcxx] [AArch64] add intrinsic to generate a bfi instruction (PR #79672)

[David Green via cfe-commits]

davemgreen wrote:

Hello. Can you explain why this is needed, as opposed to using the equivalent shift/and/ors?

https://github.com/llvm/llvm-project/pull/79672