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
Fix an annoying warning
Merge branch 'merge-2.064' into merge-2.065
Add some more MIPS implementation stuff
Remove long deprecated version identifiers
Add version identifiers of MIPS ABI.

Parses the feature string and appends the required ABI feature.
Uses the feature string to define the version identifier.
Merge branch 'merge-2.064' into merge-2.065