In test_time, be more relaxed about the time wait condition - thread scheduling/system contention may interfere with the wait and produce a longer wait than 2 seconds.
show clear error message instead of 987 when too many setjmp calls
not using Changelong anymore
big function finder tool
use invoke when doing a setjmp-guarding call via a function pointer
make sure to coerce arguments to invoke due to setjmp
Better guessing for LLVM_ROOT.

On OS X, there is a system-wide clang that is the wrong version,
so the guessing goes wrong. Looking for llvm-dis is less likely
to go wrong and is also required by the build process.
Merge pull request #1086 from waywardmonkeys/llvm-root-guessing

Better guessing for LLVM_ROOT.
clear errors on calling dead functions
add test for repeated longjmp to a single setjmp