Changes

Summary

[NewPM][CodeGen] Introduce CodeGenPassBuilder to help build codegen pipeline (details)
Revert "[NewPM][CodeGen] Introduce CodeGenPassBuilder to help build codegen pipeline" (details)
[AMDGPU][NewPM] Port amdgpu-promote-alloca(-to-vector) (details)

Commit 4646de5d75cfce3da4ddeffb6eb8e66e38238800 by Yuanfang Chen [NewPM][CodeGen] Introduce CodeGenPassBuilder to help build codegen pipeline Following up on D67687. Please refer to the RFC here http://lists.llvm.org/pipermail/llvm-dev/2020-July/143309.html `CodeGenPassBuilder` is the NPM counterpart of `TargetPassConfig` with below differences. - Debugging features (MIR print/verify, disable pass, start/stop-before/after, etc.) living in `TargetPassConfig` are moved to use PassInstrument as much as possible. (Implementation also lives in `TargetPassConfig.cpp`) - `TargetPassConfig` is a polymorphic base (virtual inheritance) to build the target-dependent pipeline whereas `CodeGenPassBuilder` is the CRTP base/helper to implement the target-dependent pipeline. The motivation is flexibility for targets to customize the pipeline, inlining opportunity, and fits the overall NPM value semantics design. - `TargetPassConfig` is a legacy immutable pass to declare hooks for targets to customize some target-independent codegen layer behavior. This is partially ported to TargetMachine::options. The rest, such as `createMachineScheduler/createPostMachineScheduler`, are left out for now. They should be implemented in LLVMTargetMachine in the future. Reviewed By: arsenm, aeubanks Differential Revision: https://reviews.llvm.org/D83608
	llvm/include/llvm/CodeGen/MachinePassRegistry.def
	llvm/include/llvm/Target/TargetMachine.h
	llvm/include/llvm/CodeGen/TargetPassConfig.h
	llvm/lib/CodeGen/TargetPassConfig.cpp
	llvm/lib/CodeGen/LLVMTargetMachine.cpp
	llvm/lib/CodeGen/CMakeLists.txt
	llvm/include/llvm/Target/CGPassBuilderOption.h
	llvm/include/llvm/CodeGen/CodeGenPassBuilder.h
	llvm/lib/CodeGen/CodeGenPassBuilder.cpp
Commit 94427af60c66ffea655a3084825c6c3a9deec1ad by Yuanfang Chen Revert "[NewPM][CodeGen] Introduce CodeGenPassBuilder to help build codegen pipeline" This reverts commit 4646de5d75cfce3da4ddeffb6eb8e66e38238800. Some bots have build failure.
	llvm/include/llvm/CodeGen/TargetPassConfig.h
	llvm/include/llvm/Target/TargetMachine.h
	llvm/lib/CodeGen/CodeGenPassBuilder.cpp
	llvm/include/llvm/Target/CGPassBuilderOption.h
	llvm/include/llvm/CodeGen/MachinePassRegistry.def
	llvm/include/llvm/CodeGen/CodeGenPassBuilder.h
	llvm/lib/CodeGen/TargetPassConfig.cpp
	llvm/lib/CodeGen/LLVMTargetMachine.cpp
	llvm/lib/CodeGen/CMakeLists.txt
Commit 0e9abcfc1920f25a959eaa08116427b795e10dd8 by aeubanks [AMDGPU][NewPM] Port amdgpu-promote-alloca(-to-vector) And add to AMDGPU opt pipeline. Don't pin an opt run to the legacy PM when -enable-new-pm=1 if these passes (or passes introduced in https://reviews.llvm.org/D93863) are in the list of passes. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D93875
	llvm/test/CodeGen/AMDGPU/sroa-before-unroll.ll
	llvm/test/CodeGen/AMDGPU/vector-alloca.ll
	llvm/lib/Target/AMDGPU/AMDGPU.h
	llvm/tools/opt/opt.cpp
	llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
	llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp