Allow using libsupc++ with LIBCXX_ENABLE_STATIC_ABI_LIBRARY. Patch from Michael Daniels.

The code cannot currently link when using libsupc++ with the
LIBCXX_ENABLE_STATIC_ABI_LIBRARY option.

This change ifdef's out the the destructor and 'what' function for
bad_array_length and bad_array_new_length when GLIBCXX is defined.
The constructors that are left in are the only functions not being provided by
libsupc++ itself, and follows the same pattern that was used to ifdef bad_alloc.

Testing was done on a Linux x86_64 host using GCC 5.4 and libc++ from ToT.
I see no change to the test results when using libsup++ or libstdc++ without
LIBCXX_ENABLE_STATIC_ABI_LIBRARY. When using libsupc++ with
LIBCXX_ENABLE_STATIC_ABI_LIBRARY it will now build and test results are the
same as those without the option specified.

Reviewed as https://reviews.llvm.org/D26186

llvm-svn: 287388

libcxx/src/new.cpp

@@ -316,6 +316,8 @@ bad_array_new_length::bad_array_new_length() _NOEXCEPT
 {
 }
 
+#ifndef __GLIBCXX__
+
 bad_array_new_length::~bad_array_new_length() _NOEXCEPT
 {
 }
@@ -326,21 +328,27 @@ bad_array_new_length::what() const _NOEXCEPT
     return "bad_array_new_length";
 }
 
+#endif // !__GLIBCXX__
+
 #endif //LIBCXXRT
 
+bad_array_length::bad_array_length() _NOEXCEPT
+{
+}
+
+#ifndef __GLIBCXX__
+
+bad_array_length::~bad_array_length() _NOEXCEPT
+{
+}
+
 const char*
 bad_array_length::what() const _NOEXCEPT
 {
     return "bad_array_length";
 }
 
-bad_array_length::bad_array_length() _NOEXCEPT
-{
-}
-
-bad_array_length::~bad_array_length() _NOEXCEPT
-{
-}
+#endif // !__GLIBCXX__
 
 #endif // _LIBCPPABI_VERSION