[clang] [llvm] [APFloat] Add APFloat support for FP6 data types (PR #94735)

[Durgadoss R via cfe-commits]

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@@ -139,6 +143,10 @@ static constexpr fltSemantics semFloat8E4M3FNUZ = {
 static constexpr fltSemantics semFloat8E4M3B11FNUZ = {
     4, -10, 4, 8, fltNonfiniteBehavior::NanOnly, fltNanEncoding::NegativeZero};
 static constexpr fltSemantics semFloatTF32 = {127, -126, 11, 19};
+static constexpr fltSemantics semFloat6E3M2FN = {
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durga4github wrote:

Yes, I tried a few other suffixes like "FNOnly", "FNNoNaN" etc. They looked weird and lengthy. So, I stayed with the "FN" suffix.

https://github.com/llvm/llvm-project/pull/94735