[llvm] [CodeGen] Represent ISD::ArgFlagsTy flags as a bitmask (NFC) (PR #217548)

[Nikita Popov via llvm-commits]

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@@ -195,6 +211,15 @@ namespace ISD {
 
     unsigned getPointerAddrSpace() const { return PointerAddrSpace; }
     void setPointerAddrSpace(unsigned AS) { PointerAddrSpace = AS; }
+
+    bool operator==(const ArgFlagsTy &Other) const {
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nikic wrote:

Why is this being added?

https://github.com/llvm/llvm-project/pull/217548