Most importantly, this gives us https://go-review.googlesource.com/7533 which
fixes a bug in go/ssa that caused test failures in the Go 1.4 standard library.
Also remove the go1.4 tag workaround. We no longer need it now that we
ship llgo-go.
Differential Revision: http://reviews.llvm.org/D8827
llvm-svn: 234133
At the same time, perform a number of simplifications:
- Rename go.tools directory to gotools.
- Import only the go directory; all required Go analysis code and
its dependencies have now been moved to this directory.
llvm-svn: 225825