Make dumpers pass on more size information initially, namely the
various Q<>Pointers. Introduce enum for those special template types
whose size does not vary with the arguments (Q<>Pointer,
std::allocators...) to make it more easily extensible.
Pass on some common QMapNode<> sizes as well.
Introduce an expression cache to the common QtDumperHelper
class and make dumpers pass some common expression values
(value offsets of common QMapNode<> incarnations).
Make CDBDumperHelper use the expression cache.
Extend dumper tester.
Make debugger tooltip API more general, have the engines check the
correct file type, figure out the expression and context from the text
editor.
Put common functionality in watchutils.cpp. In the CDB engine, check
whether a tooltip expression is a known variable within the stack frame
context. If so, retrieve via symbol group or dumpers. Cache by function
and expression.
Reviewed-by: hjk <qtc-committer@nokia.com>
