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Add gdb scripts for memquery and drsymload

Merged Derek Bruening requested to merge iX-gdb-scripts into master

Adds two gdb python scripts I've developed that may be useful to others:

  1. drsymload: loads DR symbols regardless of gdb's current state, which may include having DR symbols at the wrong address. It does this by reading /proc/self/maps and running objdump on libdynamorio.so. Ideally this would be integrated into a revived libdynamorio.so-gdb.py: that's part of #2100.

  2. memquery: prints the /proc/self/maps line for a given address. I'm still shocked gdb doesn't provide such a command natively.

Issue: #2100