[cfe-dev] constexpr bit_cast status?

[will wray via cfe-dev]

std::bit_cast was added to the C++ 20 draft this summer:
http://eel.is/c++draft/bit.cast

In September JFB added a header with implementation (in llvm namespace):
llvm/include/llvm/ADT/bit.h

  // This file implements the C++20 <bit> header.
  ...
  // - It isn't constexpr because that requires compiler support.

What compiler support is it waiting on? What's the status?
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