Added support for Microsoft-specific inline keywords

__inline is equivalent to inline.
__forceinline is used to override the cost/benefit analysis.

Change-Id: Ifc7c94c1798f98c553ffa979a722ede9df11b3f0
Merge-request: 2206
Reviewed-by: Christian Kamm <christian.d.kamm@nokia.com>
Reviewed-on: http://codereview.qt-project.org/4416


Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>