Merge triton-mlir branch - Complete rewrite of the backend from scratch (#1004)

This PR merges the `triton-mlir` branch, in which we have been quietly
rewriting the Triton backend from scratch to increase maintainability,
stability and ultimately performance. Changes to the runtime are
minimal, and this new version aims to remain backward-compatible with
the previous commit. The legacy backend is now officially deprecated,
but can still be accessed via the `legacy-backend` tag.

Co-authored-by: Keren Zhou <kerenzhou@openai.com>
Co-authored-by: Yan Chunwei <yanchunwei@outlook.com>
Co-authored-by: goostavz <109190422+goostavz@users.noreply.github.com>
Co-authored-by: Shintaro Iwasaki <siwasaki@fb.com>
Co-authored-by: Yan Da <dyanab@connect.ust.hk>
Co-authored-by: Jun Yang <yangjunpro@gmail.com>
Co-authored-by: Ian Bearman <ianb@microsoft.com>
Co-authored-by: Jason Ansel <jansel@jansel.net>
Co-authored-by: Qingyi Liu <qingyil@nvidia.com>
Co-authored-by: ben-zhang-609 <110140741+ben-zhang-609@users.noreply.github.com>
Co-authored-by: Chenggang Zhao <lyricz@yeah.net>
Co-authored-by: ben-zhang-609 <benzh609@gmail.com>
Co-authored-by: dongdongl <dongdongl@nvidia.com>

bin/CMakeLists.txt

@@ -0,0 +1,60 @@
+add_subdirectory(FileCheck)
+# add_llvm_executable(FileCheck FileCheck/FileCheck.cpp)
+# target_link_libraries(FileCheck PRIVATE LLVMFileCheck LLVMSupport)
+
+get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
+get_property(conversion_libs GLOBAL PROPERTY MLIR_CONVERSION_LIBS)
+
+add_llvm_executable(triton-opt triton-opt.cpp PARTIAL_SOURCES_INTENDED)
+
+# TODO: what's this?
+llvm_update_compile_flags(triton-opt)
+target_link_libraries(triton-opt PRIVATE
+  TritonAnalysis
+  TritonTransforms
+  TritonGPUTransforms
+  ${dialect_libs}
+  ${conversion_libs}
+  # tests
+  TritonTestAnalysis
+  # MLIR core
+  MLIROptLib
+  MLIRPass
+  MLIRTransforms
+)
+
+mlir_check_all_link_libraries(triton-opt)
+
+
+# add_llvm_executable(triton-translate triton-translate.cpp PARTIAL_SOURCES_INTENDED)
+#llvm_update_compile_flags(triton-translate)
+# target_link_libraries(triton-translate PRIVATE
+#         TritonAnalysis
+#         TritonTransforms
+#         TritonGPUTransforms
+#         TritonLLVMIR
+#         TritonDriver
+#         ${dialect_libs}
+#         ${conversion_libs}
+#         # tests
+#         TritonTestAnalysis
+
+#         LLVMCore
+#         LLVMSupport
+#         LLVMOption
+#         LLVMCodeGen
+#         LLVMAsmParser
+
+#         # MLIR core
+#         MLIROptLib
+#         MLIRIR
+#         MLIRPass
+#         MLIRSupport
+#         MLIRTransforms
+#         MLIRExecutionEngine
+#         MLIRMathToLLVM
+#         MLIRTransformUtils
+#         MLIRLLVMToLLVMIRTranslation
+#         MLIRNVVMToLLVMIRTranslation
+#         )
+# mlir_check_all_link_libraries(triton-translate)