[clang] [llvm] [OptBisect][IR] Adding a new OptPassGate for disabling passes via name (PR #145059)

[Mircea Trofin via cfe-commits]

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@@ -82,6 +83,44 @@ class LLVM_ABI OptBisect : public OptPassGate {
   int LastBisectNum = 0;
 };
 
+/// This class implements a mechanism to disable passes and individual
+/// optimizations at compile time based on a command line option
+/// (-opt-disable) in order to study how single transformations, or
+/// combinations thereof, affect the IR.
+class LLVM_ABI OptDisable : public OptPassGate {
+public:
+  /// Default constructor. Initializes the state to empty set. The disabling
+  /// will be enabled by the cl::opt call-back when the command line option
+  /// is processed.
+  /// Clients should not instantiate this class directly.  All access should go
+  /// through LLVMContext.
+  OptDisable() = default;
+
+  virtual ~OptDisable() = default;
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mtrofin wrote:

you don't need this. Also, if you did: `~OptDisable() override`

https://github.com/llvm/llvm-project/pull/145059