we can only enter the bAssumeExprLParenMode controlled block once
because the block sets bAssumeExprLParenMode to false
bAssumeExprLParenMode is only true if the first token read in the
method is LPAREN
so we can only enter this block if the current token is LPAREN and
its the first token processed, so the token can't be BYVAL
Change-Id: I6e668fca4d127d7dbfe447e2d9f2231e05278a7d
6b709b27b3