revert: re PR target/51135 (SIGSEGV during exception cleanup on win32)

revert: re PR target/51135 (SIGSEGV during exception cleanup on win32)

2011-12-12  Paolo Carlini  <paolo.carlini@oracle.com>

	Revert:
	2011-12-12  Kai Tietz  <ktietz@redhat.com>

	PR libstdc++/51135
	* libsupc++/cxxabi.h (__cxa_dtor_type): New type.
	(__cxa_throw): Use it for destructor-argument.
	* libsupc++/eh_throw.cc (__cxa_throw): Likewise.
	* libsupc++/unwind-cxx.h (__cxa_exception): Change type of member
	exceptionDestructor to __cxa_dtor_type.
	* config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_THISCALL_ON_DTOR):
	Define.
	(__cxa_dtor_type): Declare target secific type variant.
	* config/os/mingw32/os_defines.h: Likewise.

From-SVN: r182250