rr 4.4.0

[MBot]

Compile releases with CMAKE_BUILD_TYPE=Release for improved performance.
Support for record and replay of chromium-browser and google-chrome via various bug fixes: notably, syncing syscall writes to mmapped files, and handling tasks forked with invalid TLS areas.
Many improvements to make signal-state tracking match the kernel more accurately.
Support for Linux 4.8 kernels (in particular, PTRACE_SYSCALL notifications being delivered before seccomp notifications instead of after).
General recording overhead improvements (thanks to Keno Fischer).
Support for accessing thread-local variables while debugging (thanks to Tom Tromey).
Syscall support expanded.
Many bugs fixed.

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