swift234

CMake: Make built Xcode projects put binaries in a more Makefile-like structure.

Previously, the CMake-built Xcode projects for LLVM, Clang, and Xcode
would put binaries into bin/Debug, lib/Debug, bin/Release, etc., which
differed from the makefile build's Debug/bin, Debug/lib, Release/bin,
etc. We installed a few weird-looking symlinks to paper over the
differences.

Mainline LLVM and Clang recently changed to use the makefile layout,
breaking the build of Xcode projects for Swift. Do the same for
Swift's build.


Swift SVN r11819