C++ PATCH for various lambda bugs (51494, 51884, 56222, 51884)

[Jason Merrill]

The first two patches deal with issues with 'this' capture; we were 
inappropriately capturing 'this' for uses of static members and forming 
pointers to members, and for uses in unevaluated context.  The last 
patch avoids a crash from recursive use of dfs_walk when instantiating a 
class with virtual functions using a local class whose scope involves a 
qualified-id.

Tested x86_64-pc-linux-gnu, applying to trunk.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 56222.patch
Type: text/x-patch
Size: 8754 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20130308/356a4c92/attachment.bin>