Fix #2815
Fix a stack alignment issue
Make sure core dumps are still generated

This removes the non-stack-overflow segfault handler. An improved
version will be added later. But that is a separate change
Merge pull request #3802 from staticfloat/atlasfix

Eliminate need to `make -C deps install-atlas`
bytestring should take any integer length, not just Int
sorting: add some missing deprecations (yes, more).
Merge pull request #3769 from JuliaLang/kf/macunwind

RFC: Catch all stack overflows on mac.
Don't allow ByteStrings to be repeated a negative number of times. (Fixes #3806)
Pkg2: clarify message when cloning the cache of a package repo.
fix #3806: don't allow Array(Uint8,-1)
Raytracer benchmark
fix #3807
fix #3810
Merge pull request #3811 from IainNZ/master

Raytracer benchmark
First draft of codespeedization of test/perf.

To use, run `make codespeed` in `test/perf`
Update default unit titles
Expect env variables instead of Base.BUILD_INFO for now
Annotate new BLAS tests for codespeed
typos!
Add blas tests into the Makefile so `make codespeed` gets them as well