llvm-project/llvm/lib/Target/MSIL

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Vector instructions support.

ShuffleVector
ExtractElement
InsertElement

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Add "OpaqueType" type.

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Variable argument functions support, "VAArg" instruction and some intrinsics.
CLI instruction "arglist" can get argument list descriptor for current function
that can be passed to other functions.

 va_arg = Function "System.ArgIterator::GetNextArg()"
 va_list = Class "System.ArgIterator"
 va_start = Instruction "arglist"
 va_end = Do nothing

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If possible get used types inside of "MSILWriter" class, do not pass trougth
"MSILModule" class.

	getAnalysis<FindUsedTypes>().getTypes()

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"switch" instruction emulation with CLI "switch" instruction.

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Write linker for external function, because function export need to know 
dynamic library where function located.

.method static hidebysig pinvokeimpl("msvcrt.dll" cdecl)
	void free(void*) preservesig {}

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DLLImport'ed variables support with the help of win32 envoronment.

	"LoadLibrary" - to load dynamic library into address space.
	"GetProcAddress" - to recive variable address by name.