[PATCH] [Refactor] Replace RegionPasses by FunctionPasses

[Johannes Doerfert]

I will cut this commit into pieces (as far as possible) but I wanted to get some initial feedback.

In http://reviews.llvm.org/D7986#136089, @grosser wrote:

> The patch Zino refers to was committed in 231485. It did not have a large impact on our LNT performance builders (which do not seem to even see the slowdown we try to address here). However, on my laptop I was able to reproduce this performance issue in a cmake release build and Zino's patch fixes it at least for tramp3d-v4 nicely. Johannes, could you check if there is still a performance issue that needs to be addressed?


How can the buildbots run e.g., tramp3d in 9sec when it takes for me with lnt
[1,2] >40sec for one of the source files alone. This is not new but they do
perform that good all the time... I'm puzzled here...

[1] --mllvm=-polly -clfag=-O3 in the cmd line options of the lnt runtest command

  (Polly is linked into clang/opt)

[2] Alternatively the command with polly basically disabled (via polly-only-func):

  /home/johannes/projects/polly/llvm-build/bin/clang++ -fno-exceptions -I/home/johannes/mysandbox/nt/test-2015-03-01_14-37-50/sample-0/MultiSource/Benchmarks/tramp3d-v4 -I/home/johannes/repos/llvm-test-suite/MultiSource/Benchmarks/tramp3d-v4 -I/home/johannes/repos/llvm-test-suite/include -I../../../include -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -DNDEBUG -O3 -mllvm -polly -m64 -fomit-frame-pointer -c /home/johannes/repos/llvm-test-suite/MultiSource/Benchmarks/tramp3d-v4/tramp3d-v4.cpp -o /dev/null  -mllvm -polly-only-func=dsadsasadsa -mllvm -polly-allow-nonaffine-branches=false


http://reviews.llvm.org/D7986

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