+ compiler/sysmsym.pas: Do the same for for all tsym constructors.
  + compiler/symtype.pas: Generate internalerror in  tcompilerppufile.putderef
    if a deref field has index -1, as this means that buildderef was not called
    while it should have been called.
  + compiler/symtable.pas: Fix bug report itself by adding an extra local variable
    CHANGED to add extra cycles in tstoredsymtable.buildderef_referenced method.

New tests for this bug report: tests/webtbs/tw35139.pp and  tests/webtbs/tw35139a.pp

git-svn-id: trunk@41425 -