Generate x86 Assembly with Go (library)

 This is the library package of avo.
 .
 avo makes high-performance Go assembly easier to write, review and
 maintain. The avo package presents a familiar assembly-like interface
 that simplifies development without sacrificing performance:
 + Use Go control structures for assembly generation; avo programs
   are Go programs
 + Register allocation: write functions with virtual registers and avo
   assigns physical registers for you
 + Automatically load arguments and store return values: ensure memory
   offsets are correct for complex structures
 + Generation of stub files to interface with your Go package