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i#2991: ignore more instru for DR syscall num id

Merged Derek Bruening requested to merge i2991-filter-syscalls into master

Updates DR's system call number identification to ignore more instrumentation:

  • A meta write to the sysreg is ignored
  • Branches are ignored unless they clearly skip the sysreg write or the syscall instr

Adds a missing syscall filter event to drmemtrace.

Adds a debug-build assert if a client has a pre- or post-syscall event but no filter event, to help catch a common type of error.

Fixes #2991 (closed)