Add markup for libc++ dylib availability

Libc++ is used as a system library on macOS and iOS (amongst others). In order
for users to be able to compile a binary that is intended to be deployed to an
older version of the platform, clang provides the
availability attribute <https://clang.llvm.org/docs/AttributeReference.html#availability>_
that can be placed on declarations to describe the lifecycle of a symbol in the
library.

See docs/DesignDocs/AvailabilityMarkup.rst for more information.

Differential Revision: https://reviews.llvm.org/D31739

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302172 91177308-0d34-0410-b5e6-96231b3b80d8

test/libcxx/debug/containers/db_associative_container_tests.pass.cpp

@@ -12,6 +12,9 @@
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
 // MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // test container debugging
 
 #define _LIBCPP_DEBUG 1

test/libcxx/debug/containers/db_sequence_container_iterators.pass.cpp

@@ -12,6 +12,9 @@
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
 // MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // test container debugging
 
 #define _LIBCPP_DEBUG 1

test/libcxx/debug/containers/db_string.pass.cpp

@@ -12,6 +12,9 @@
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
 // MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // test container debugging
 
 #define _LIBCPP_DEBUG 1

test/libcxx/debug/containers/db_unord_container_tests.pass.cpp

@@ -12,6 +12,9 @@
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
 // MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // test container debugging
 
 #define _LIBCPP_DEBUG 1

test/libcxx/debug/debug_abort.pass.cpp

@@ -10,6 +10,9 @@
 
 // MODULES_DEFINES: _LIBCPP_DEBUG=0
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // Test that the default debug handler aborts the program.
 
 #define _LIBCPP_DEBUG 0

test/libcxx/debug/debug_throw.pass.cpp

@@ -11,6 +11,9 @@
 // UNSUPPORTED: libcpp-no-exceptions
 // MODULES_DEFINES: _LIBCPP_DEBUG=0
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // Test that the default debug handler can be overridden and test the
 // throwing debug handler.
 

test/libcxx/debug/debug_throw_register.pass.cpp

@@ -12,6 +12,9 @@
 // MODULES_DEFINES: _LIBCPP_DEBUG=1
 // MODULES_DEFINES: _LIBCPP_DEBUG_USE_EXCEPTIONS
 
+// Can't test the system lib because this test enables debug mode
+// UNSUPPORTED: with_system_cxx_lib
+
 // Test that defining _LIBCPP_DEBUG_USE_EXCEPTIONS causes _LIBCPP_ASSERT
 // to throw on failure.