* obj-vms.c: Add C++ support with ctors/dtors sections. Add weak
symbol definitions.
(Ctors_Symbols, Dtors_Symbols): New symbol chains.
(ps_CTORS, ps_DTORS): New section types.
(vms_fixup_xtors_section): New function
(Ctors_Psect, Dtors_Psect): Define.
(IS_GXX_XTOR): Define
(global_symbol_directory): Change check of gxx_bug_fixed to 0.
Filter static constructors/destructors and add to
Ctors_Symbols/Dtors_Symbols chain.
(vms_write_object_file): Write Ctors_Symbols/Dtors_Symbols to
appropriate section.
* tc-alpha.h (TARGET_FORMAT): Rename "evax-alpha" to "vms-alpha".
* makefile.vms: Merge vax/vms support.