Add ADD (zx imm12), NOP, MOV (rs), LDA, TBB, TBH, MOV (zx imm16) and CLZ thumb instructions

[gdkchan]

Implements the following T32 instructions:

• ADD (zero-extended 12-bit immediate variant)
• NOP
• MOV (register shifted by register variant)
• MOV (zero-extended 16-bit immediate variant)
• TBB/TBH (Table Branch Byte/Halfword, those only exists on T32)
• LDA (Load Acquire)
• CLZ (Count Leading Zeros)

Additionally fixes some existing implementations:

• Fix T16 BLX using Blx rather than Blxr. It was causing InvalidCastException because Blx expects an immediate address, not a register.
• Fix T16 CBZ/CBNZ instructions control flow. IsAarch32UncoditionalBranch was returning true for those instructions, which would cause the code immediately following it (branch not taken path) to be skipped and was silently generating incorrect code.
• Fix T32 LDRD/STRD encoding. It was overlapping with LDA/STL in the OpCodeTable.
• Fix T32 LDRD/STRD immediate decoding. It was not being multiplied by 4.
• Fix T32 LDRD/STRD Rt2 register. Unlike the A32 variant, on Thumb the Rt2 register can be explicitly specified on the instruction, instead of being the register immediately after Rt. The InstEmit function and OpCode interfaces were changed to account for this.

This allows Vita2HOS to launch again, it goes as far as the old version that did not use as many Thumb instructions. I planned to get more work done here, but since this contains some important fixes, I decided to PR it sooner rather than later.

[github-actions]

Download the artifacts for this pull request:

• ryujinx-Release-1.1.0+f109343-linux_x64
• ryujinx-Release-1.1.0+f109343-osx_x64
• ryujinx-Release-1.1.0+f109343-win_x64

Experimental GUI (Avalonia)

• ava-ryujinx-Release-1.1.0+f109343-linux_x64
• ava-ryujinx-Release-1.1.0+f109343-osx_x64
• ava-ryujinx-Release-1.1.0+f109343-win_x64

GUI-less (SDL2)

• sdl2-ryujinx-headless-Release-1.1.0+f109343-linux_x64
• sdl2-ryujinx-headless-Release-1.1.0+f109343-osx_x64
• sdl2-ryujinx-headless-Release-1.1.0+f109343-win_x64

Only for Developers

• ava-ryujinx-Debug-1.1.0+f109343-linux_x64
• ava-ryujinx-Debug-1.1.0+f109343-osx_x64
• ava-ryujinx-Debug-1.1.0+f109343-win_x64
• ryujinx-Debug-1.1.0+f109343-linux_x64
• ryujinx-Debug-1.1.0+f109343-osx_x64
• ryujinx-Debug-1.1.0+f109343-win_x64
• sdl2-ryujinx-headless-Debug-1.1.0+f109343-linux_x64
• sdl2-ryujinx-headless-Debug-1.1.0+f109343-osx_x64
• sdl2-ryujinx-headless-Debug-1.1.0+f109343-win_x64

[riperiperi]

LGTM.

[xerpi]

Thank you very much for the PR, much appreciated!