Fix few warnings

Avoid deadce on OP_INEG since it sets the condition codes, and the OP…

…_LNEG decomposition depends on this on x86. Fixes mono#10320.

[msbuild] Fix import set to expected path when invalid imports are al…

…lowed.

It was failing to resolve <Import> to correct path because it allowed
invalid imports too early in Import.ForEachExtensionPathTillFound().

It is due to Project.AddSingleImport() that checks if invalid imports
can be ignored by load setting. But simply removing this check results
in regressions in nunit tests that fails to report required invalid imports.

This bug was one of the blockers to build fsharp-droid from xbuild:
https://github.com/fahadsuhaib/fsharp-droid

Remove NET_2_1 default (broken) context

Treat param area stack slots as being part of the callee frame, not t…

…he caller, so precise stack marking works for methods with tail calls as well.

Make sure we don't corrupt the heap when serializing a unix domain so…

…cketaddr.

	* socket-io.c (create_object_from_sockaddr): The resulting array size must
	be two bytes larger than the sockaddr one since we always serialize the family
	kind at the beginning.

	This fixes a crash on MD-linux-amd64-mono-sgen-3.0 running unit tests.

Remove SRE.UnmanagedMarshal dependency from System.Reflection.

	* FieldInfo.cs:
	* MonoMethod.cs:
	* ParameterInfo.cs: Remove silly dep on UnmanagedMarshal to use
	MarshalAsAttribute which is what we need in the end.

	* icall.c:
	* reflection.c: Use the custom attribute type instead of the SRE
	one. This allows FULL_AOT_RUNTIME to work with stuff that uses
	MarshalAs.

Bump version to 3.0.0.

Fix base type definition in repl. Fixes mono#5913.

Bump the debian submodule to the right revision again

someone accidentally reverted it to an old commit.