Revert "[libc++] Replace uses of _LIBCPP_ALWAYS_INLINE by _LIBCPP_INLINE_VISIBILITY"

This reverts commit r336369. The commit had two problems:
1. __pbump was marked as _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY instead of
   _LIBCPP_INLINE_VISIBILITY, which lead to two symbols being added in the
   dylib and the check-cxx-abilist failing.

2. The LLDB tests started failing because they undefine
   `_LIBCPP_INLINE_VISIBILITY`. I need to figure out why they do that and
   fix the tests before we can go forward with this change.

llvm-svn: 336382
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 195a499d638db5157a64c9c816b76154096ecd52
diff --git a/include/memory b/include/memory
index fd830d7..31d4e4f 100644
--- a/include/memory
+++ b/include/memory
@@ -679,7 +679,7 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _ValueType>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_ALWAYS_INLINE
 _ValueType __libcpp_relaxed_load(_ValueType const* __value) {
 #if !defined(_LIBCPP_HAS_NO_THREADS) && \
     defined(__ATOMIC_RELAXED) &&        \
@@ -691,7 +691,7 @@
 }
 
 template <class _ValueType>
-inline _LIBCPP_INLINE_VISIBILITY
+inline _LIBCPP_ALWAYS_INLINE
 _ValueType __libcpp_acquire_load(_ValueType const* __value) {
 #if !defined(_LIBCPP_HAS_NO_THREADS) && \
     defined(__ATOMIC_ACQUIRE) &&        \
@@ -3483,7 +3483,7 @@
     virtual const char* what() const  _NOEXCEPT;
 };
 
-_LIBCPP_NORETURN inline _LIBCPP_INLINE_VISIBILITY
+_LIBCPP_NORETURN inline _LIBCPP_ALWAYS_INLINE
 void __throw_bad_weak_ptr()
 {
 #ifndef _LIBCPP_NO_EXCEPTIONS