[llvm] [SandboxIR] Implement BitCastInst (PR #101227)

[via llvm-commits]

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@@ -1386,6 +1390,26 @@ class PtrToIntInst final : public CastInst {
 #endif // NDEBUG
 };
 
+class BitCastInst : public CastInst {
+public:
+  static Value *create(Value *Src, Type *DestTy, BBIterator WhereIt,
+                       BasicBlock *WhereBB, Context &Ctx,
+                       const Twine &Name = "");
+  static Value *create(Value *Src, Type *DestTy, Instruction *InsertBefore,
+                       Context &Ctx, const Twine &Name = "");
+  static Value *create(Value *Src, Type *DestTy, BasicBlock *InsertAtEnd,
+                       Context &Ctx, const Twine &Name = "");
+
+  static bool classof(const Value *From) {
+    return isa<Instruction>(From) &&
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vporpo wrote:

Well it may work for now, but I don't think it is super safe. Once we introduce multi-Instructions then the class of `From->Val` won't necessarily be representative of the whole sandboxir::Value. So I think it is safer to keep it as is.

https://github.com/llvm/llvm-project/pull/101227