Revert "try to find out where the hang is (revert later)"

This reverts commit 273cbdd8dfa30471ee83a17080027e613dd0b134.
Reuse code in isXNumber() to avoid duplication and unneeded computations
Merge pull request #455 from Dmitry-Me/refactorNumberIsX

Reuse code in isXNumber() to avoid duplication and unneeded computations
Fixed #4776 (FP: Assignment of function parameter has no effect outside the function, with goto)
Fixed #6231 (mingw compiler error: Path::getAbsoluteFilePath)
Ticket #6232 (cppOut of bounds array access)

--HG--
extra : rebase_source : 79ed3533a12a486ea3ed3f09f9bc55b1a4771161
Ticket #6187: Avoid infinite loop if eraseDeadCode does not remove anything (this time without memory corruption).
Fixed #6234 (FP : shift by too many bits is undefined on a QT container)
Merge pull request #456 from simartin/ticket_6817_take2

Ticket #6187: Avoid infinite loop if eraseDeadCode does not remove anything (this time without memory corruption).
Merge branch 'master' into travis_gcc_testsuite