[flang-commits] [clang] [libcxx] [lld] [lldb] [compiler-rt] [clang-tools-extra] [openmp] [mlir] [llvm] [flang] [clang] Add `intrin0.h` header to mimic `intrin0.h` used by MSVC STL for clang-cl (PR #75711)

[Aaron Ballman via flang-commits]

AaronBallman wrote:

> If we land this as-is, it'll tank build time on Windows.

I would like some measurements so we can compare build times on Windows.

https://github.com/llvm/llvm-project/pull/75711