[clang] [clang] Make -fveclib={ArmPL, SLEEF} imply -fno-math-errno (PR #112580)

[Benjamin Maxwell via cfe-commits]

================
@@ -3125,6 +3140,13 @@ static void RenderFloatingPointOptions(const ToolChain 
&TC, const Driver &D,
       TrappingMathPresent = true;
       FPExceptionBehavior = "strict";
       break;
+    case options::OPT_fveclib:
+      VecLibArg = A;
+      if (llvm::is_contained(VecLibImpliesNoMathErrno, A->getValue())) {
+        MathErrno = false;
+        NoMathErrnoWasImpliedByVecLib = true;
+      }
----------------
MacDue wrote:

Done (and added test cases for the two scenarios discussed in these comments) 
:+1: 

https://github.com/llvm/llvm-project/pull/112580
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