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

[Serge Pavlov via cfe-commits]

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+// RUN: %clang_cc1 -emit-llvm -triple i386-linux -Wno-unknown-pragmas %s -o - | FileCheck %s
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spavloff wrote:

No, this macro is managed by the code in Sema, because pragma FENV_ROUND is processed there. If only `-E` is specified, __ROUNDING_MODE__ is always an empty string. We handle __FLT_EVAL_METHOD__ similarly.

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