Add a stack-based object creation profiler

Add a stack-based object creation profiler

The simple instantiate-in-context way of profiling object
creation doesn't work anymore because the VME's contexts don't
necessarily map to C++ contexts anymore. The new profiler
introduces two stacks of contexts, one for currently running
ranges (such as components) and one for ranges that will be
revived later to profile componentComplete() and similar things.

Task-number: QTCREATORBUG-10631

Change-Id: Idf19b2adf062bc9c185b3bb5ff5229381f577645
Reviewed-by: Ulf Hermann <ulf.hermann@digia.com>
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>