Support call <register> in X86InstructionSet

[ItsMilos]

this fixes

078 Call 0, rcx, rdx, r8, r9, stack:0x0, stack:0x8, stack:0x10, stack:0x18, stack:0x20, stack:0x28, stack:0x30, stack:0x38, stack:0x40, stack:0x48, stack:0x50, stack:0x58, stack:0x60, stack:0x68, stack:0x70, stack:0x78, stack:0x80, stack:0x88, stack:0x90, stack:0x98, stack:0xA0, stack:0xA8, stack:0xB0, stack:0xB8, stack:0xC0, stack:0xC8, stack:0xD0, stack:0xD8, stack:0xE0, stack:0xE8

[coveralls]

Pull Request Test Coverage Report for Build 12372631157

Details

• 0 of 3 (0.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.006%) to 27.491%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
Cpp2IL.Core/InstructionSets/X86InstructionSet.cs	0	3	0.0%

Totals
Change from base Build 12324180199:	-0.006%
Covered Lines:	3360
Relevant Lines:	10397

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💛 - Coveralls