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5740bf2f53
deal with any IR that happens to show up. This makes it work on ppc32 and should fix occasionally-reported bugs on x86/amd64 where it bombs due to having to deal with multiple date references in a single instruction. The new scheme is based around the idea of a queue of memory events which are outstanding, in the sense that no IR has yet been generated to do the relevant helper calls. The presence of the queue -- currently 16 entries deep -- gives cachegrind more scope for combining multiple memory references into a single helper function call. As a result it runs 3%-5% faster than the previous version, on x86. This commit also changes the type of the tool interface function 'tool_discard_basic_block_info' and clarifies its meaning. See comments in include/pub_tool_tooliface.h. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@4903