llvm-top.  By Michael Schuerig, with some small
tweaks to make the "don't configure if already
configured" logic work.

llvm-svn: 62842

llvm-svn: 40119

found by prepending a .
In build-for-llvm-top.sh, dereference variables for exansion.

llvm-svn: 39936

This also avoids a fork bomb from the llvm-top/build script which
doesn't know how to handle cycles in the dependence graph.

llvm-svn: 39933

of the cyclic depndency between llvm and llvm-gcc-4-0.

llvm-svn: 39910

llvm-svn: 38521

of llvm from that level.

llvm-svn: 38423

llvm-svn: 38422