June 12th 2017 Toolchain Release

It's been a month since the last stable toolchain release, which seems like a
good time for another one. Here's the changes since the last release:

binutils

• GP-relative disassembly hints are working again.
• 32-bit BFDs can handle 64-bit objects.
• c.li, c.andi, and c.addiw disassembly correctly.

gcc

• A new "-mstrict-align" option is availiable, which enforces strict
  alignment. Without this argument the compiler assumes unaligned operations
  are slow instead of assuming they're illegal. This is meant to be used in
  machine-mode code on platforms that don't support unaligned accesses.
• Sub-XLEN PIC loads now extend correctly.
• An internal compiler error related to sub-word moves has been fixed.
  glibc
• The initial GP generation cannot be relaxed.

newlib

• We are using a version based on 2.5.