[llvm] [NFC][TableGen] Refactor `getIntrinsicFnAttributeSet` (PR #106587)

[Matt Arsenault via llvm-commits]

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@@ -481,9 +482,33 @@ static AttributeSet getIntrinsicArgAttributeSet(LLVMContext &C, unsigned ID) {
 static AttributeSet getIntrinsicFnAttributeSet(LLVMContext &C, unsigned ID) {
   switch (ID) {
     default: llvm_unreachable("Invalid attribute set number");)";
-  for (const CodeGenIntrinsic &Intrinsic : Ints) {
+
+  auto getEffectiveME = [](const CodeGenIntrinsic &Int) {
+    MemoryEffects ME = Int.ME;
+    // TODO: IntrHasSideEffects should affect not only readnone intrinsics.
+    if (ME.doesNotAccessMemory() && Int.hasSideEffects)
+      ME = MemoryEffects::unknown();
+    return ME;
+  };
+
+  // Returns true is `Int` has a non-empty set of function attributes.
+  // Note that NoUnwind = !canThrow, so we need to negate its sense for testing
+  // if the intrinsic has NoUnwind attribute.
+  auto hasFnAttributes = [&getEffectiveME](const CodeGenIntrinsic &Int) {
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arsenm wrote:

These don't need to be lambdas, they can just be deeper functions 

https://github.com/llvm/llvm-project/pull/106587