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/math.h b/include/math.h
index 3cc72aa..658ba93 100644
--- a/include/math.h
+++ b/include/math.h
@@ -314,7 +314,7 @@
 #ifdef signbit
 
 template <class _A1>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_signbit(_A1 __lcpp_x) _NOEXCEPT
 {
@@ -376,7 +376,7 @@
 #ifdef fpclassify
 
 template <class _A1>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 int
 __libcpp_fpclassify(_A1 __lcpp_x) _NOEXCEPT
 {
@@ -422,7 +422,7 @@
 #ifdef isfinite
 
 template <class _A1>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isfinite(_A1 __lcpp_x) _NOEXCEPT
 {
@@ -456,7 +456,7 @@
 #ifdef isinf
 
 template <class _A1>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isinf(_A1 __lcpp_x) _NOEXCEPT
 {
@@ -504,7 +504,7 @@
 #ifdef isnan
 
 template <class _A1>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isnan(_A1 __lcpp_x) _NOEXCEPT
 {
@@ -548,7 +548,7 @@
 #ifdef isnormal
 
 template <class _A1>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isnormal(_A1 __lcpp_x) _NOEXCEPT
 {
@@ -578,7 +578,7 @@
 #ifdef isgreater
 
 template <class _A1, class _A2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isgreater(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
@@ -608,7 +608,7 @@
 #ifdef isgreaterequal
 
 template <class _A1, class _A2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isgreaterequal(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
@@ -638,7 +638,7 @@
 #ifdef isless
 
 template <class _A1, class _A2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isless(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
@@ -668,7 +668,7 @@
 #ifdef islessequal
 
 template <class _A1, class _A2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_islessequal(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
@@ -698,7 +698,7 @@
 #ifdef islessgreater
 
 template <class _A1, class _A2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_islessgreater(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {
@@ -728,7 +728,7 @@
 #ifdef isunordered
 
 template <class _A1, class _A2>
-_LIBCPP_INLINE_VISIBILITY
+_LIBCPP_ALWAYS_INLINE
 bool
 __libcpp_isunordered(_A1 __lcpp_x, _A2 __lcpp_y) _NOEXCEPT
 {