MIR version 0.1.2 released

New version (0.1.2) of MIR has been released

Major changes from v0.1.1 to v0.1.2:

• Numerous bugs were fixed
• Shared library is now built and installed beside the static library
• MIR was ported to musl-based Linux systems, e.g. alpine Linux
• Generator was improved
  • Register allocator was significantly sped up
  • Alloca code generation was improved (alloca insn consolidation)
• No red zone x86_64 ABI is now supported
• Generator debug info were enhanced and improved
• Documentation in Chinese was added