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

[Matt Arsenault via llvm-commits]

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@@ -878,6 +896,10 @@ void IEEEFloat::copySignificand(const IEEEFloat &rhs) {
    for the significand.  If double or longer, this is a signalling NaN,
    which may not be ideal.  If float, this is QNaN(0).  */
 void IEEEFloat::makeNaN(bool SNaN, bool Negative, const APInt *fill) {
+  if (semantics->nonFiniteBehavior == fltNonfiniteBehavior::NoNanInf) {
+    assert(false && "This floating point format does not support NaN\n");
+    return;
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arsenm wrote:

llvm_unreachable, also no dead return 

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