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
Revert "Revert part of my pkg2 WIP that accidentally made it into the last commit"

This reverts commit 07b6e921a32f8482e5a147cc6d5d6a21a8bfe5f9.
Stateless Pkg2.fixup
Fix an infinite loop in fixup
Allow fixup on arrays of arbitrary string types
Merge pull request #3784 from JuliaLang/kf/pkg2fixup

Pkg2: Remove state from fixup
Bump zlib version. Someone complained that the older one was no longer
available.
Fix #3790
Add vectorized iround(T, x)
Sorting: proper API documentation.
Eliminate need to `make -C deps install-atlas`, only need to `make -C deps compile-atlas` now.
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)