[clang] [llvm] [HIP][MacOS] Mach-O support and Darwin toolchain fixes (PR #183991)

[Paulius Velesko via cfe-commits]

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@@ -391,6 +391,12 @@ class LLVM_LIBRARY_VISIBILITY Darwin : public AppleMachO {
   void VerifyTripleForSDK(const llvm::opt::ArgList &Args,
                           const llvm::Triple Triple) const;
 
+protected:
+  /// Lazily initialize the target platform from the triple when
+  /// AddDeploymentTarget has not run yet (e.g. when Darwin is used as
+  /// a host toolchain for device offloading).
+  void ensureTargetInitialized() const;
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pvelesko wrote:

Is this comment about `void ensureTargetInitialized() const;`? 

https://github.com/llvm/llvm-project/pull/183991