[clang] [clang] Macro for constant rounding mode (PR #92699)

[Serge Pavlov via cfe-commits]

spavloff wrote:

The discussion for the proposed mechanism is open here: https://discourse.llvm.org/t/rfc-calling-functions-if-pragma-fenv-round-is-present/79372

> > This change introduces macro ROUNDING_MODE, which is a string dependent on the constant rounding mode
>
> It expands to an identify, not a string literal, right?

Exactly. 


https://github.com/llvm/llvm-project/pull/92699