Merge commit e24f90190c77 from llvm git (by Brad Smith):

[Driver] Enable outline atomics for FreeBSD/aarch64 (#156089)

The compiler_rt helper functions have been built since 12.4, 13.1, 14
and anything newer.

MFC after:	3 days

contrib/llvm-project/clang/lib/Driver/ToolChains/FreeBSD.h

@@ -78,6 +78,11 @@ class LLVM_LIBRARY_VISIBILITY FreeBSD : public Generic_ELF {
   void AddHIPIncludeArgs(const llvm::opt::ArgList &DriverArgs,
                          llvm::opt::ArgStringList &CC1Args) const override;
 
+  bool IsAArch64OutlineAtomicsDefault(
+      const llvm::opt::ArgList &Args) const override {
+    return true;
+  }
+
   UnwindTableLevel
   getDefaultUnwindTableLevel(const llvm::opt::ArgList &Args) const override;
   bool isPIEDefault(const llvm::opt::ArgList &Args) const override;