Add quotes in version_ge in bash for more robust expansion

Change-Id: Id5dc22d70f2833fd9d39b23fe0f2cad0ead114e1
Add compat defines for g++ and fix build scripts to not use llvm/compiler_rt

Change-Id: I7e6ca3c0d5a3fb4c8a450e65912566cefd35f645
Turn on libc++abi tracing.

Change-Id: I7fcf95a535e36678a1a3f34391e92040ee55f98a
Wire up continue_unwind by calling the bytecode interpreter

Change-Id: I8f235b93e78af7dfd538dd1d73856187947c3a41