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add support for the encls/enclu/enclv instructions

Merged S.J.R. van Schaik requested to merge github/fork/StephanvanSchaik/iX-enclX into master

This PR adds support for the encls, enclu and enclv instructions as described by chapter 41 "SGX Instruction References" in volume 3D of the Intel 64 and IA-32 Architectures Software Developer's Manual. These are used in supervisor mode, user mode and VMM mode respectively.

These instructions are somewhat similar to cpuid, in that they accept all have a leaf function that can be specified through the eax register. However, unlike cpuid, the ebx, ecx and edx can both be used as inputs and outputs depending on the specific leaf function.

While Intel SGX is usable on a select set of Intel CPUs, it is usable both in 32-bit and 64-bit mode on those CPUs.

This PR is as follows:

  • Implement encls, enclu and enclv in the decoder for x86.
  • Add INSTR_CREATE macros for encls, enclu and enclv.
  • Add test cases for encls, enclu and enclv.