[clang] [llvm] APFloat: Fix maxnum and minnum with sNaN (PR #112854)

[Matt Arsenault via cfe-commits]

================
@@ -582,7 +582,46 @@ TEST(APFloatTest, MinNum) {
   APFloat zp(0.0);
   APFloat zn(-0.0);
   EXPECT_EQ(-0.0, minnum(zp, zn).convertToDouble());
-  EXPECT_EQ(-0.0, minnum(zn, zp).convertToDouble());
+
+  APInt intPayload_89ab(64, 0x89ab);
----------------
arsenm wrote:

Can / should cover this in lit constant folding tests of the intrinsics 

https://github.com/llvm/llvm-project/pull/112854
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