Merge pull request #83856 from gottesmm/pr-3a5aea3430d587158233a9d47b24c1b46ddd709e

[frontend] Expose via a LangOption whether or not the compiler is compiling for a triple that supports AArch64 TBI.

include/swift/Basic/LangOptions.h

@@ -671,6 +671,9 @@ namespace swift {
     bool RestrictNonProductionExperimentalFeatures = false;
 #endif
 
+    /// Set to true if we support AArch64TBI.
+    bool HasAArch64TBI = false;
+
     bool isConcurrencyModelTaskToThread() const {
       return ActiveConcurrencyModel == ConcurrencyModel::TaskToThread;
     }

include/swift/Frontend/Frontend.h

@@ -274,6 +274,9 @@ public:
   /// C++ stdlib is the default for the specified target.
   void computeCXXStdlibOptions();
 
+  /// Compute whether or not we support aarch64TBI
+  void computeAArch64TBIOptions();
+
   /// Computes the runtime resource path relative to the given Swift
   /// executable.
   static void computeRuntimeResourcePathFromExecutablePath(