C++: add utility method to dump usages.
C++: add utility method to dump usages.

Change-Id: Icff6e9310a45e66b573fb2a6623a10e025c43539
Reviewed-by: Nikolai Kosjar <9571db158ca61a0d070db010803474231fa0cbab@digia.com>

amyvmiwei/qt-creator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,danimo/qt-creator,richardmg/qtcreator,xianian/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,malikcjm/qtcreator,malikcjm/qtcreator,danimo/qt-creator,omniacreator/qtcreator,malikcjm/qtcreator,xianian/qt-creator,kuba1/qtcreator,colede/qtcreator,farseerri/git_code,amyvmiwei/qt-creator,darksylinc/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,maui-packages/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,colede/qtcreator,darksylinc/qt-creator,omniacreator/qtcreator,xianian/qt-creator,farseerri/git_code,AltarBeastiful/qt-creator,colede/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,Distrotech/qtcreator,maui-packages/qt-creator,Distrotech/qtcreator,maui-packages/qt-creator,farseerri/git_code,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,danimo/qt-creator,omniacreator/qtcreator,omniacreator/qtcreator,malikcjm/qtcreator,xianian/qt-creator,colede/qtcreator,danimo/qt-creator,darksylinc/qt-creator,omniacreator/qtcreator,farseerri/git_code,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,darksylinc/qt-creator,kuba1/qtcreator,xianian/qt-creator,maui-packages/qt-creator,richardmg/qtcreator,Distrotech/qtcreator,danimo/qt-creator,kuba1/qtcreator,danimo/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,malikcjm/qtcreator,colede/qtcreator,danimo/qt-creator,richardmg/qtcreator,omniacreator/qtcreator,AltarBeastiful/qt-creator,malikcjm/qtcreator,darksylinc/qt-creator,colede/qtcreator,amyvmiwei/qt-creator,richardmg/qtcreator,darksylinc/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,kuba1/qtcreator,farseerri/git_code,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,maui-packages/qt-creator,amyvmiwei/qt-creator,maui-packages/qt-creator,xianian/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,xianian/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,malikcjm/qtcreator,richardmg/qtcreator,farseerri/git_code,AltarBeastiful/qt-creator,Distrotech/qtcreator,darksylinc/qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,richardmg/qtcreator,danimo/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,kuba1/qtcreator