add support for storing custom data on a MonoClass, so Unity can store classID and sealedness in there, for faster lookups

Use constrained virtual method call for value-typed instances instead of boxing

On my (cursed?) MacBook Pro, calling
System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()
results in an exception:

	System.ArgumentException: length
		at System.Array.Copy (System.Array sourceArray, Int32 sourceIndex, System.Array destinationArray, Int32 destinationIndex, Int32 length) [0x00000] in <filename unknown>:0
		at System.Net.NetworkInformation.MacOsNetworkInterface.ImplGetAllNetworkInterfaces () [0x00000] in <filename unknown>:0
		at System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces () [0x00000] in <filename unknown>:0

Some printfs later, and we see why:

	Array.Copy(array.Length=12, 3, array.Length=0, 0, 0)
	Array.Copy(array.Length=12, 4, array.Length=0, 0, 0)
	Array.Copy(array.Length=12, 4, array.Length=0, 0, 0)
	Array.Copy(array.Length=12, 3, array.Length=6, 0, 6)
	Array.Copy(array.Length=12, 3, array.Length=6, 0, 6)
	Array.Copy(array.Length=12, 3, array.Length=8, 0, 4)
	Array.Copy(array.Length=12, 4, array.Length=6, 0, 6)
	Array.Copy(array.Length=12, 8, array.Length=6, 0, 6)
	# BOOM!

(Apparently I have 8 interfaces: lo0, gif0, stf0, en0, en1, fw0, p2p0,
and vboxnet0.)

The problem is readily obvious: we're trying to read 6 bytes of data
when only 4 are available, and Array.Copy() complains appropriately.

The fix -- which looks to almost contradict a02076ba -- is to use
`sockaddrdl.sdl_data.Length - sockaddrdl.sdl_nlen` instead of
`sockaddrdl.sdl_data.Length - macAddress.Length` (or sdl_alen).
sdl_nlen is the offset into the source sockaddrdl.sdl_data array, and
in this case sockaddrdl.sdl_alen (the length of the destination
macAddress) isn't the same as sockaddrdl.sdl_nlen, hence the breakage.

Conflicts:
	mcs/class/System/System.Net.NetworkInformation/NetworkInterface.cs

Case 593918.

Fix random crash on Mavericks 64-bit. Backport slightly modified version of https://github.com/mono/mono/commit/978e4ebbd66b231fa6e4f8b32451b87d447bfcf2 and https://github.com/mono/mono/commit/7c85c560ea935b28c5e8492b1a0f6d5e6fe3c14e

Altered invocation IL generation to use constrained virtual calls instead of boxing for value types, if possible.

Recent Mono fixes

Case 585394.

Unity 4.5

# By Andreia Gaita (9) and others
# Via Andreia Gaita (2) and Levi Bard (1)
* 'unity-staging' of github.com:Unity-Technologies/mono:
  [sharpziplib] Fix DiskStorage so it doesn't keep private state when it's overridden
  Add required overload for adding entries to zip with metadata (otherwise file attributes will be incorrect)
  Fix bad cherry-pick of liveness change.
  added api to unity liveness for multithreading
  Fix several 64bit pointers being truncated to 32bit integers.
  Fix GC losing objects on OSX64 due to registers not getting pushed as roots.
  Nunit and Mono.Cairo are no longer in the 1.0 dirs
  Nunit build fixes for the 1.0-less world
  Fix copying of files, rsync is more reliable (and preserves attributes)
  Fix cecil installation
  Only build the bare essentials on the 1.1 profile, and make all tools based on 2.0 assemblies
  Remove dupe source file from sources list
  Don't try to use a potentially null assembly name, the assembly might not have been found.
  Kill really really old ziplib code
  Update SharpZipLib to latest upstream v0.86.0.518

Fix ARM IMT calls on AOT platform. ARM AOT implementation of imt_thunks supports only linear array/list of IMT items

Commits:
75ce710c Add required overload for adding entries to zip with metadata (otherwise file attributes will be incorrect)
af3b7435 Fix bad cherry-pick of liveness change.
d257a76a added api to unity liveness for multithreading
a351aadc Fix several 64bit pointers being truncated to 32bit integers.
8c1b80d4 Fix GC losing objects on OSX64 due to registers not getting pushed as roots.
228d7f00 Nunit and Mono.Cairo are no longer in the 1.0 dirs
d61e7eb8 Nunit build fixes for the 1.0-less world
34fa8c76 Fix copying of files, rsync is more reliable (and preserves attributes)
09ec3632 Fix cecil installation
328bb2e5 Only build the bare essentials on the 1.1 profile, and make all tools based on 2.0 assemblies
ff8c6acd Remove dupe source file from sources list
cb3ea9a3 Don't try to use a potentially null assembly name, the assembly might not have been found.
59a2e0c5 Kill really really old ziplib code
437f1d97 Update SharpZipLib to latest upstream v0.86.0.518

Custom implementations of DiskStorage may need to control the stream, temporary filename
or how the stream is open (custom file permissions, etc). Keeping private state in
the base class makes it useless for implementors.

Add required overload for adding entries to zip with metadata (otherwise file attributes will be incorrect)

Update SharpZipLib to latest version and default to building most libraries with the 2.0 profile

svn path=/trunk/mono/; revision=143172

svn path=/trunk/mcs/; revision=143173

Unity 4.5 staging