public AsmTypePrefix parseAsmTypePrefix()
Parses an AsmTypePrefix
Note that in the following grammar definition the first identifier must be "near", "far", "word", "dword", or "qword". The second identifier must be "ptr".
asmTypePrefix:
     Identifier Identifier?
   | 'byte' Identifier?
   | 'short' Identifier?
   | 'int' Identifier?
   | 'float' Identifier?
   | 'double' Identifier?
   | 'real' Identifier?
   ;