Split exception.cpp and new.cpp implementation into different files for different runtimes.

exception.cpp is a bloody mess. It's full of confusing #ifdef branches for
each different ABI library we support, and it's getting unmaintainable.

This patch breaks down exception.cpp into multiple different header files,
roughly one per implementation. Additionally it moves the definitions of
exceptions in new.cpp into the correct implementation header.

This patch also removes an unmaintained libc++abi configuration.
This configuration may still be used by Apple internally but there
are no other possible users. If it turns out that Apple still uses
this configuration internally I will re-add it in a later commit.
See http://llvm.org/PR31904.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294707 91177308-0d34-0410-b5e6-96231b3b80d8

include/exception

@@ -82,6 +82,10 @@ template <class E> void rethrow_if_nested(const E& e);
 #include <cstdlib>
 #include <type_traits>
 
+#if defined(_LIBCPP_ABI_MICROSOFT)
+#include <vcruntime_exception.h>
+#endif
+
 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
 #pragma GCC system_header
 #endif
@@ -89,6 +93,7 @@ template <class E> void rethrow_if_nested(const E& e);
 namespace std  // purposefully not using versioning namespace
 {
 
+#if !defined(_LIBCPP_ABI_MICROSOFT)
 class _LIBCPP_EXCEPTION_ABI exception
 {
 public:
@@ -105,6 +110,7 @@ public:
     virtual ~bad_exception() _NOEXCEPT;
     virtual const char* what() const _NOEXCEPT;
 };
+#endif // !_LIBCPP_ABI_MICROSOFT
 
 typedef void (*unexpected_handler)();
 _LIBCPP_FUNC_VIS unexpected_handler set_unexpected(unexpected_handler) _NOEXCEPT;