att parser: support for more mnemonic

found some 'jg,pt' in icc/mkl generated binaries which crashed the
parser, here an example:
 dd8ccd:   3e 7f 90   jg,pt  dd8c60 <mkl_blas_avx2_dtrsm_kernel...

osaca/parser/parser_x86att.py

@@ -158,7 +158,7 @@ class ParserX86ATT(BaseParser):
         # Instructions
         # Mnemonic
         mnemonic = pp.ZeroOrMore(pp.Literal('data16') | pp.Literal('data32')) + pp.Word(
-            pp.alphanums
+            pp.alphanums + ','
         ).setResultsName('mnemonic')
         # Combine to instruction form
         operand_first = pp.Group(