[llvm] [InferAttrs] Mark errnomem-setting libcalls as such (PR #124742)

[Nikita Popov via llvm-commits]

================
@@ -555,12 +591,15 @@ bool llvm::inferNonMandatoryLibFuncAttrs(Function &F,
     Changed |= setDoesNotThrow(F);
     Changed |= setDoesNotCapture(F, 0);
     Changed |= setOnlyReadsMemory(F, 0);
+    Changed |=
+        setOnlyAccessesInaccessibleOrArgOrErrnoMem(F, MR::ModRef, MR::Ref);
     break;
   case LibFunc_mktime:
     Changed |= setRetAndArgsNoUndef(F);
     Changed |= setDoesNotThrow(F);
     Changed |= setWillReturn(F);
     Changed |= setDoesNotCapture(F, 0);
+    Changed |= setOnlyAccessesInaccessibleOrArgOrErrnoMem(F);
----------------
nikic wrote:

mktime also interacts with the tzname, timezone and daylight globals.

https://github.com/llvm/llvm-project/pull/124742