fourthTier: We should have a reduced FTL LLVM pipeline tool in the repository

fourthTier: We should have a reduced FTL LLVM pipeline tool in the repository
https://bugs.webkit.org/show_bug.cgi?id=118647

Rubber stamped by Geoffrey Garen and Mark Hahnenberg.

Add a tool that takes in an LLVM bitcode file and JITs it in exactly the same
way that the FTL would.

Also add a tool that combines multiple LLVM modules generated by FTL into a
single module.

* ReducedFTL: Added.
* ReducedFTL/ReducedFTL.c: Added.
(usage):
(currentTime):
(MemorySection):
(mmAllocateCodeSection):
(mmAllocateDataSection):
(mmApplyPermissions):
(mmDestroy):
(symbolLookupCallback):
(main):
* ReducedFTL/build.sh: Added.
* ReducedFTL/combineModules.rb: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@153275 268f45cc-cd09-0410-ab3c-d52691b4dbfc