[PATCH] D114082: [WIP] Normalize String Attributes

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LLVM IR supports free form string attributes. Those are used both internally in various passes, or to convey information from the front-end to the middle-end, and externally by third party projects.

This patch normalizes the internal part while still being open to extension for third-party project. The basic idea is to have one immutable object per string attribute, with its hash computed at compile-time. Then instead of referencing attributes per their name, one must reference them by their key.

Pros:

- avoid typos in attribute spelling etc, turn them in compile-time error
- it is possible to list all internal keys in one place, and eventually (not implemented in this patch) to normalize them (we currently have a mixture of underscores and hyphens). And to document them.
- hashes are precomputed, which leads to faster indexing and faster testing for attribute presence


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D114082

Files:
  clang/lib/CodeGen/CGBlocks.cpp
  clang/lib/CodeGen/CGCall.cpp
  clang/lib/CodeGen/CGClass.cpp
  clang/lib/CodeGen/CGDecl.cpp
  clang/lib/CodeGen/CGDeclCXX.cpp
  clang/lib/CodeGen/CGExpr.cpp
  clang/lib/CodeGen/CGOpenMPRuntime.cpp
  clang/lib/CodeGen/CGVTables.cpp
  clang/lib/CodeGen/CodeGenFunction.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/lib/CodeGen/MicrosoftCXXABI.cpp
  clang/lib/CodeGen/TargetInfo.cpp
  llvm/include/llvm/Analysis/SyncDependenceAnalysis.h
  llvm/include/llvm/Analysis/TargetLibraryInfo.h
  llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
  llvm/include/llvm/Analysis/VectorUtils.h
  llvm/include/llvm/CodeGen/CommandFlags.h
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/IR/Assumptions.h
  llvm/include/llvm/IR/Attributes.h
  llvm/include/llvm/IR/Attributes.td
  llvm/include/llvm/IR/Function.h
  llvm/include/llvm/IR/GlobalVariable.h
  llvm/include/llvm/IR/InstrTypes.h
  llvm/include/llvm/ProfileData/SampleProf.h
  llvm/lib/Analysis/IVDescriptors.cpp
  llvm/lib/Analysis/InlineAdvisor.cpp
  llvm/lib/Analysis/InlineCost.cpp
  llvm/lib/Analysis/VectorUtils.cpp
  llvm/lib/AsmParser/LLParser.cpp
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
  llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
  llvm/lib/CodeGen/AsmPrinter/WinException.cpp
  llvm/lib/CodeGen/CommandFlags.cpp
  llvm/lib/CodeGen/FEntryInserter.cpp
  llvm/lib/CodeGen/GlobalISel/CallLowering.cpp
  llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
  llvm/lib/CodeGen/MachineFunction.cpp
  llvm/lib/CodeGen/MachineFunctionSplitter.cpp
  llvm/lib/CodeGen/MachineOutliner.cpp
  llvm/lib/CodeGen/PatchableFunction.cpp
  llvm/lib/CodeGen/PrologEpilogInserter.cpp
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
  llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/CodeGen/StackProtector.cpp
  llvm/lib/CodeGen/TargetLoweringBase.cpp
  llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
  llvm/lib/CodeGen/TargetOptionsImpl.cpp
  llvm/lib/CodeGen/TargetRegisterInfo.cpp
  llvm/lib/CodeGen/XRayInstrumentation.cpp
  llvm/lib/ExecutionEngine/ExecutionEngineBindings.cpp
  llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
  llvm/lib/IR/Assumptions.cpp
  llvm/lib/IR/AttributeImpl.h
  llvm/lib/IR/Attributes.cpp
  llvm/lib/IR/AutoUpgrade.cpp
  llvm/lib/IR/Core.cpp
  llvm/lib/IR/DiagnosticInfo.cpp
  llvm/lib/IR/Function.cpp
  llvm/lib/IR/Instructions.cpp
  llvm/lib/IR/Statepoint.cpp
  llvm/lib/IR/Verifier.cpp
  llvm/lib/Target/TargetLoweringObjectFile.cpp
  llvm/lib/Target/TargetMachine.cpp
  llvm/lib/Target/X86/X86DynAllocaExpander.cpp
  llvm/lib/Target/X86/X86FastISel.cpp
  llvm/lib/Target/X86/X86FrameLowering.cpp
  llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86MCInstLower.cpp
  llvm/lib/Target/X86/X86RegisterInfo.cpp
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/lib/Target/X86/X86WinEHState.cpp
  llvm/lib/Transforms/CFGuard/CFGuard.cpp
  llvm/lib/Transforms/Coroutines/CoroEarly.cpp
  llvm/lib/Transforms/Coroutines/CoroElide.cpp
  llvm/lib/Transforms/Coroutines/CoroInternal.h
  llvm/lib/Transforms/Coroutines/CoroSplit.cpp
  llvm/lib/Transforms/IPO/Attributor.cpp
  llvm/lib/Transforms/IPO/AttributorAttributes.cpp
  llvm/lib/Transforms/IPO/CrossDSOCFI.cpp
  llvm/lib/Transforms/IPO/FunctionImport.cpp
  llvm/lib/Transforms/IPO/GlobalOpt.cpp
  llvm/lib/Transforms/IPO/LowerTypeTests.cpp
  llvm/lib/Transforms/IPO/OpenMPOpt.cpp
  llvm/lib/Transforms/IPO/SampleProfile.cpp
  llvm/lib/Transforms/IPO/WholeProgramDevirt.cpp
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
  llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
  llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
  llvm/lib/Transforms/Instrumentation/ThreadSanitizer.cpp
  llvm/lib/Transforms/ObjCARC/ObjCARCOpts.cpp
  llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
  llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
  llvm/lib/Transforms/Utils/CodeExtractor.cpp
  llvm/lib/Transforms/Utils/EntryExitInstrumenter.cpp
  llvm/lib/Transforms/Utils/FunctionImportUtils.cpp
  llvm/lib/Transforms/Utils/InlineFunction.cpp
  llvm/lib/Transforms/Utils/Local.cpp
  llvm/lib/Transforms/Utils/ModuleUtils.cpp
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/tools/bugpoint-passes/TestPasses.cpp
  llvm/unittests/IR/InstructionsTest.cpp
  llvm/unittests/ProfileData/SampleProfTest.cpp
  llvm/unittests/Transforms/Utils/VFABIUtils.cpp

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