to break up CFG diamonds by banishing one of the blocks to the end of
the function, which is bad for code density and branch size.

This does pessimize MultiSource/Benchmarks/Ptrdist/yacr2, the
benchmark cited as the reason for the change, however I've examined
the code and it looks more like a case of gaming a particular
branch than of being generally applicable.

llvm-svn: 84803

llvm-svn: 81293

llvm-svn: 79992

llvm-svn: 41097

Remove && from the end of the lines to prevent tests from throwing run
lines into the background. Also, clean up places where the same command
is run multiple times by using a temporary file.

llvm-svn: 36142

llvm-svn: 35683

go to the same destination. Now we're producing really good code for
switch-lower-feature.ll testcase

llvm-svn: 35672

llvm-svn: 35345