Merge of 2.065.0-b3.

The new visitor class is used for IR generation. This removes some modifications from DMD source.
ÂFix LLVM 3.1 build
Do not try to install crc32.d - it is gone!
Merge branch 'merge-2.064' into merge-2.065

Conflicts:
	dmd2/root/port.c
Merge branch 'merge-2.064' into merge-2.065

Conflicts:
	dmd2/cond.c
Add missing comma
Merge branch 'merge-2.064' into merge-2.065

Conflicts:
	runtime/druntime
Merge of DMD FE 2.065.0
Merge branch 'master' into merge-2.065
Merge branch 'merge-2.064' into merge-2.065
Add files to support Linux/MIPS64.

Support is yet not complete: varargs and fiber support is missing.
Merge branch 'merge-2.064' into merge-2.065
Merge branch 'merge-2.064' into merge-2.065
Merge branch 'merge-2.064' into merge-2.065
Merge branch 'merge-2.064' into merge-2.065
Add some more MIPS implementation stuff
Remove long deprecated version identifiers
Merge branch 'merge-2.064' into merge-2.065
Unbreak the druntime build
Merge branch 'merge-2.064' into merge-2.065