[clang] [llvm] [APFloat] Add APFloat support for FP4 data type (PR #95392)

[Jakub Kuderski via cfe-commits]

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@@ -6907,6 +7028,42 @@ TEST(APFloatTest, ConvertE2M3FToE3M2F) {
   EXPECT_EQ(status, APFloat::opInexact);
 }
 
+TEST(APFloatTest, ConvertDoubleToE2M1F) {
+  bool losesInfo;
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kuhar wrote:

It's an output parameter in `.convert`, so shouldn't matter either way?

https://github.com/llvm/llvm-project/pull/95392