C++ PATCH for c++/42687 (arg-dependent lookup regression)

[Jason Merrill]

When we fixed using explicit scope to suppress virtual calling, it broke 
using parentheses to suppress argument-dependent lookup.  Fixed thus.

Tested x86_64-pc-linux-gnu, applied to trunk, 4.4, 4.5 and 4.6.
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: 42687.patch
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20110427/cad9239e/attachment.ksh>