`Neg` OpCode is not supported.

[ElektroKill]

Describe the bug KoiVM converts the CIL Neg OpCode into two different expressions depending on the type.

• For R4 and R8 values it emits 0 - a in place of -a
• For all other values it emits ~a + 1 in place of -a

To Reproduce Devirtualize sample file provided for issue #44.

Expected behavior The Neg OpCode should be emitted for both of the aforementioned expressions.

Screenshots Example of 'obfuscated' Neg:

[Washi1337]

Note: This is most likely supposed to be done on IL Ast level, as it is just a special case of the normal a - b operation:

https://github.com/Washi1337/OldRod/blob/6773f8dcc780efae20722fe3242d7afc6144d564/src/OldRod.Core/Ast/IL/Transform/LogicSimplifier.cs#L104

[Washi1337]

By the way, the provided sample does not have a test case for R4 and R8. Could you maybe upload one?

[ElektroKill]

Sure, here is a new version of the original sample which includes two new additional methods with test cases for R4 and R8. sample-new.zip