Define MONO_ARCH_NOMAP32BIT on Windows for amd64.
2010-07-06  Zoltan Varga  <vargaz@gmail.com>

	* mini-amd64.h mini-amd64.c tramp-amd64.c aot-compiler.c: Change the IMT
	register to be the same as the RGCTX register, the two can't be used together on
	the same call.

svn path=/trunk/mono/; revision=159928

Conflicts:
	mono/mini/ChangeLog