[Driver] Enable outline atomics for FreeBSD/aarch64

Author: brad0

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;

clang/test/Driver/aarch64-features.c

@@ -44,6 +44,9 @@
 // RUN: %clang --target=aarch64-windows-gnu -rtlib=compiler-rt \
 // RUN: -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-OUTLINE-ATOMICS-OFF %s
 
+// RUN: %clang --target=aarch64-unknown-freebsd -rtlib=compiler-rt \
+// RUN: -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-OUTLINE-ATOMICS-ON %s
+
 // RUN: %clang --target=aarch64-unknown-openbsd -rtlib=compiler-rt \
 // RUN: -### -c %s 2>&1 | FileCheck -check-prefix=CHECK-OUTLINE-ATOMICS-ON %s