[llvm] [TLI] Support inferring function attributes for sincos[f|l] (PR #108554)

[Matt Arsenault via llvm-commits]

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@@ -1270,6 +1270,18 @@ bool llvm::inferNonMandatoryLibFuncAttrs(Function &F,
     Changed |= setOnlyWritesMemory(F);
     Changed |= setWillReturn(F);
     break;
+  case LibFunc_sincos:
+  case LibFunc_sincosf:
+  case LibFunc_sincosl:
+    Changed |= setDoesNotThrow(F);
+    Changed |= setDoesNotFreeMemory(F);
+    Changed |= setOnlyWritesMemory(F);
+    Changed |= setOnlyWritesMemory(F, 1);
+    Changed |= setOnlyWritesMemory(F, 2);
+    Changed |= setDoesNotCapture(F, 1);
+    Changed |= setDoesNotCapture(F, 2);
+    Changed |= setWillReturn(F);
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arsenm wrote:

Does this need something for argmemonly? 

Unrelated but all of this code should probably be using AttrBuilder instead of a set function that directly operates on the function 

https://github.com/llvm/llvm-project/pull/108554