Fix exception specification for operator delete as spotted by clang 3.3


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13598 a5019735-40e9-0310-863c-91ae7b9d1cf9
Silence clang warnings about uninitialised and unused values in
memcheck testcases.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13599 a5019735-40e9-0310-863c-91ae7b9d1cf9