New command-line options:
- `/unwindv3`: Enable V3 unwind information format
New MASM directives:
- `.push2reg` / `.pop2reg`: Push/pop register pairs (PUSH2/POP2)
- `.beginepilog` / `.endepilog`: Delimit epilog unwind regions
- `.popreg`, `.freestack`, `.restorereg`, `.restorexmm128`,
`.unsetframe`: Epilog counterparts of existing prolog directives
- `.pushframe code`: MASM syntax for interrupt handlers with error codes
New built-in symbol:
- `@UnwindVersion`: Returns the current x64 unwind version being used.
Error diagnostics:
- Prolog directives after `.endprolog` are diagnosed
- Epilog directives outside `.beginepilog`/`.endepilog` are diagnosed
- Nested `.beginepilog` is diagnosed
- Unwind v3 directives or using extended registers in directives without
unwind v3 are diagnosed
Daniel Paoliello
5a52d68d6b