[PATCH] DataLayout is mandatory, update the API to reflect it with references.

[Mehdi AMINI]

Hi echristo,

Now that the DataLayout is a mandatory part of the module, let's start
cleaning the codebase. This patch is a first attempt at doing that.

This patch is not exactly NFC as for instance some places were passing a
nullptr instead of the DataLayout, possibly just because there was a
default value on the DataLayout argument to many functions in the API.
Even though it is not purely NFC, there is no change in the validation.

I turned as many pointer to DataLayout to references, this helped figuring
out all the places where a nullptr could come up.

I had initially a local version of this patch broken into over 30 independant,
commits but some later commit were cleaning the API and touching part of the
code modified in the previous commits, so the intermediate steps are not very
clean. Here is the squashed result.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8158

Files:
  include/llvm/Analysis/AliasAnalysis.h
  include/llvm/Analysis/ConstantFolding.h
  include/llvm/Analysis/IVUsers.h
  include/llvm/Analysis/InstructionSimplify.h
  include/llvm/Analysis/LazyValueInfo.h
  include/llvm/Analysis/Loads.h
  include/llvm/Analysis/LoopAccessAnalysis.h
  include/llvm/Analysis/MemoryBuiltins.h
  include/llvm/Analysis/MemoryDependenceAnalysis.h
  include/llvm/Analysis/PHITransAddr.h
  include/llvm/Analysis/ScalarEvolution.h
  include/llvm/Analysis/ScalarEvolutionExpander.h
  include/llvm/Analysis/TargetFolder.h
  include/llvm/Analysis/ValueTracking.h
  include/llvm/IR/IRBuilder.h
  include/llvm/IR/InstrTypes.h
  include/llvm/IR/Value.h
  include/llvm/Target/TargetLowering.h
  include/llvm/Transforms/IPO/LowerBitSets.h
  include/llvm/Transforms/Utils/BuildLibCalls.h
  include/llvm/Transforms/Utils/Cloning.h
  include/llvm/Transforms/Utils/Local.h
  include/llvm/Transforms/Utils/LoopUtils.h
  include/llvm/Transforms/Utils/SimplifyLibCalls.h
  lib/Analysis/AliasAnalysis.cpp
  lib/Analysis/BasicAliasAnalysis.cpp
  lib/Analysis/ConstantFolding.cpp
  lib/Analysis/DependenceAnalysis.cpp
  lib/Analysis/IPA/GlobalsModRef.cpp
  lib/Analysis/IPA/InlineCost.cpp
  lib/Analysis/IVUsers.cpp
  lib/Analysis/InstructionSimplify.cpp
  lib/Analysis/LazyValueInfo.cpp
  lib/Analysis/Lint.cpp
  lib/Analysis/Loads.cpp
  lib/Analysis/LoopAccessAnalysis.cpp
  lib/Analysis/MemDerefPrinter.cpp
  lib/Analysis/MemoryBuiltins.cpp
  lib/Analysis/MemoryDependenceAnalysis.cpp
  lib/Analysis/ScalarEvolution.cpp
  lib/Analysis/ScalarEvolutionExpander.cpp
  lib/Analysis/ValueTracking.cpp
  lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  lib/CodeGen/CodeGenPrepare.cpp
  lib/CodeGen/MachineFunction.cpp
  lib/CodeGen/ScheduleDAGInstrs.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/TargetLoweringBase.cpp
  lib/CodeGen/WinEHPrepare.cpp
  lib/IR/Instructions.cpp
  lib/IR/Value.cpp
  lib/Target/Mips/MipsDelaySlotFiller.cpp
  lib/Target/NVPTX/NVPTXAsmPrinter.cpp
  lib/Target/PowerPC/PPCCTRLoops.cpp
  lib/Target/PowerPC/PPCLoopDataPrefetch.cpp
  lib/Target/PowerPC/PPCLoopPreIncPrep.cpp
  lib/Target/R600/AMDGPUTargetTransformInfo.cpp
  lib/Target/R600/R600ISelLowering.cpp
  lib/Transforms/IPO/ArgumentPromotion.cpp
  lib/Transforms/IPO/ConstantMerge.cpp
  lib/Transforms/IPO/GlobalOpt.cpp
  lib/Transforms/IPO/LowerBitSets.cpp
  lib/Transforms/IPO/MergeFunctions.cpp
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  lib/Transforms/InstCombine/InstCombineInternal.h
  lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  lib/Transforms/InstCombine/InstCombinePHI.cpp
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  lib/Transforms/InstCombine/InstCombineShifts.cpp
  lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  lib/Transforms/Instrumentation/AddressSanitizer.cpp
  lib/Transforms/Instrumentation/BoundsChecking.cpp
  lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
  lib/Transforms/Instrumentation/MemorySanitizer.cpp
  lib/Transforms/Instrumentation/ThreadSanitizer.cpp
  lib/Transforms/ObjCARC/DependencyAnalysis.cpp
  lib/Transforms/ObjCARC/ObjCARC.h
  lib/Transforms/ObjCARC/ObjCARCAliasAnalysis.cpp
  lib/Transforms/ObjCARC/ObjCARCOpts.cpp
  lib/Transforms/ObjCARC/ProvenanceAnalysis.cpp
  lib/Transforms/ObjCARC/ProvenanceAnalysis.h
  lib/Transforms/ObjCARC/ProvenanceAnalysisEvaluator.cpp
  lib/Transforms/Scalar/AlignmentFromAssumptions.cpp
  lib/Transforms/Scalar/BDCE.cpp
  lib/Transforms/Scalar/ConstantProp.cpp
  lib/Transforms/Scalar/CorrelatedValuePropagation.cpp
  lib/Transforms/Scalar/DeadStoreElimination.cpp
  lib/Transforms/Scalar/EarlyCSE.cpp
  lib/Transforms/Scalar/GVN.cpp
  lib/Transforms/Scalar/IndVarSimplify.cpp
  lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp
  lib/Transforms/Scalar/JumpThreading.cpp
  lib/Transforms/Scalar/LICM.cpp
  lib/Transforms/Scalar/LoadCombine.cpp
  lib/Transforms/Scalar/LoopIdiomRecognize.cpp
  lib/Transforms/Scalar/LoopInstSimplify.cpp
  lib/Transforms/Scalar/LoopRerollPass.cpp
  lib/Transforms/Scalar/LoopRotation.cpp
  lib/Transforms/Scalar/LoopStrengthReduce.cpp
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  lib/Transforms/Scalar/LoopUnswitch.cpp
  lib/Transforms/Scalar/MemCpyOptimizer.cpp
  lib/Transforms/Scalar/SCCP.cpp
  lib/Transforms/Scalar/SROA.cpp
  lib/Transforms/Scalar/ScalarReplAggregates.cpp
  lib/Transforms/Scalar/Scalarizer.cpp
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
  lib/Transforms/Scalar/SimplifyCFGPass.cpp
  lib/Transforms/Scalar/Sink.cpp
  lib/Transforms/Scalar/TailRecursionElimination.cpp
  lib/Transforms/Utils/BuildLibCalls.cpp
  lib/Transforms/Utils/CloneFunction.cpp
  lib/Transforms/Utils/InlineFunction.cpp
  lib/Transforms/Utils/Local.cpp
  lib/Transforms/Utils/LoopSimplify.cpp
  lib/Transforms/Utils/LoopUnroll.cpp
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  lib/Transforms/Utils/PromoteMemoryToRegister.cpp
  lib/Transforms/Utils/SSAUpdater.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  lib/Transforms/Utils/SimplifyInstructions.cpp
  lib/Transforms/Utils/SimplifyLibCalls.cpp
  lib/Transforms/Vectorize/BBVectorize.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  unittests/IR/IRBuilderTest.cpp
  unittests/IR/InstructionsTest.cpp

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