Model statement wise reduction dependences

+ Collect reduction dependences
+ Introduced TYPE_RED in Dependences.h which can be used to obtain the
  reduction dependences
+ Used TYPE_RED to prevent parallelization while we do not have a privatizing
  code generation
+ Relax the dependences for non-parallel code generation
+ Add privatization dependences to ensure correctness
+ 12 Test cases to check for reduction and privatization dependences
[PowerPC] Fix small argument stack slot offset for LE

When small arguments (structures < 8 bytes or "float") are passed in a
stack slot in the ppc64 SVR4 ABI, they must reside in the least
significant part of that slot.  On BE, this means that an offset needs
to be added to the stack address of the parameter, but on LE, the least
significant part of the slot has the same address as the slot itself.

For the most part, this is handled in the LLVM back-end, where I just
fixed the LE case in commit r211368.

However, there is one piece of the clang front-end that is also aware of
these stack-slot offsets: PPC64_SVR4_ABIInfo::EmitVAArg.  This patch
updates that routine to take endianness into account.