[llvm] [LLVM] Change Intrinsic::ID to encode target and intrinsic index (PR #113576)

[Matt Arsenault via llvm-commits]

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@@ -33,8 +33,54 @@
 #include "llvm/IR/IntrinsicsXCore.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/Type.h"
+#include "llvm/Support/IntrinsicID.h"
 
 using namespace llvm;
+using namespace Intrinsic;
+
+/// Table of per-target intrinsic name tables.
+#define GET_INTRINSIC_TARGET_DATA
+#include "llvm/IR/IntrinsicImpl.inc"
+#undef GET_INTRINSIC_TARGET_DATA
+size_t constexpr NumTargets = sizeof(TargetInfos) / sizeof(TargetInfos[0]);
+
+// Returns true if the given intrinsic ID is valid, that is, its value is one
+// of the enum values defined for this intrinsic (including not_intrinsic).
+bool Intrinsic::IsIntrinsicIDValid(ID ID) {
+  if (ID == Intrinsic::not_intrinsic)
+    return true;
+  auto Decoded = DecodeIntrinsicIDNoFail(ID);
+  if (!Decoded)
+    return false;
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arsenm wrote:

no fail but then it needs a null check? 

https://github.com/llvm/llvm-project/pull/113576