Revert "Update aosp/master libcxx rebase to r263688"

The world is burning.

This reverts commit c004fd909c006eec55077c52ee119e1fa338c9e9, reversing
changes made to 1418e4163da4bb0b9e3fe496e51c23a0dce399d9.
diff --git a/include/condition_variable b/include/condition_variable
index 10e0077..1af2484 100644
--- a/include/condition_variable
+++ b/include/condition_variable
@@ -124,18 +124,14 @@
     condition_variable __cv_;
     shared_ptr<mutex>  __mut_;
 public:
-    _LIBCPP_INLINE_VISIBILITY
     condition_variable_any();
 
-    _LIBCPP_INLINE_VISIBILITY
     void notify_one() _NOEXCEPT;
-    _LIBCPP_INLINE_VISIBILITY
     void notify_all() _NOEXCEPT;
 
     template <class _Lock>
         void wait(_Lock& __lock);
     template <class _Lock, class _Predicate>
-        _LIBCPP_INLINE_VISIBILITY
         void wait(_Lock& __lock, _Predicate __pred);
 
     template <class _Lock, class _Clock, class _Duration>
@@ -145,30 +141,27 @@
 
     template <class _Lock, class _Clock, class _Duration, class _Predicate>
         bool
-        _LIBCPP_INLINE_VISIBILITY
         wait_until(_Lock& __lock,
                    const chrono::time_point<_Clock, _Duration>& __t,
                    _Predicate __pred);
 
     template <class _Lock, class _Rep, class _Period>
         cv_status
-        _LIBCPP_INLINE_VISIBILITY
         wait_for(_Lock& __lock,
                  const chrono::duration<_Rep, _Period>& __d);
 
     template <class _Lock, class _Rep, class _Period, class _Predicate>
         bool
-        _LIBCPP_INLINE_VISIBILITY
         wait_for(_Lock& __lock,
                  const chrono::duration<_Rep, _Period>& __d,
                  _Predicate __pred);
 };
 
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 condition_variable_any::condition_variable_any()
     : __mut_(make_shared<mutex>()) {}
 
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 void
 condition_variable_any::notify_one() _NOEXCEPT
 {
@@ -176,7 +169,7 @@
     __cv_.notify_one();
 }
 
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 void
 condition_variable_any::notify_all() _NOEXCEPT
 {
@@ -203,7 +196,7 @@
 }  // __mut_.unlock(), __lock.lock()
 
 template <class _Lock, class _Predicate>
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 void
 condition_variable_any::wait(_Lock& __lock, _Predicate __pred)
 {
@@ -225,7 +218,7 @@
 }  // __mut_.unlock(), __lock.lock()
 
 template <class _Lock, class _Clock, class _Duration, class _Predicate>
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 condition_variable_any::wait_until(_Lock& __lock,
                                    const chrono::time_point<_Clock, _Duration>& __t,
@@ -238,7 +231,7 @@
 }
 
 template <class _Lock, class _Rep, class _Period>
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 cv_status
 condition_variable_any::wait_for(_Lock& __lock,
                                  const chrono::duration<_Rep, _Period>& __d)
@@ -247,7 +240,7 @@
 }
 
 template <class _Lock, class _Rep, class _Period, class _Predicate>
-inline
+inline _LIBCPP_INLINE_VISIBILITY
 bool
 condition_variable_any::wait_for(_Lock& __lock,
                                  const chrono::duration<_Rep, _Period>& __d,