Revert "[mlir][index][spirv] Add conversion for index to spirv (#68085)"

This caused linker issues on a buildbot:
https://lab.llvm.org/buildbot/#/builders/61/builds/50716.

This reverts commit 3c07a21.

Author: kuhar

mlir/include/mlir/Conversion/IndexToSPIRV/IndexToSPIRV.h

@@ -35,7 +35,6 @@
 #include "mlir/Conversion/GPUToSPIRV/GPUToSPIRVPass.h"
 #include "mlir/Conversion/GPUToVulkan/ConvertGPUToVulkanPass.h"
 #include "mlir/Conversion/IndexToLLVM/IndexToLLVM.h"
-#include "mlir/Conversion/IndexToSPIRV/IndexToSPIRV.h"
 #include "mlir/Conversion/LinalgToStandard/LinalgToStandard.h"
 #include "mlir/Conversion/MathToFuncs/MathToFuncs.h"
 #include "mlir/Conversion/MathToLLVM/MathToLLVM.h"

mlir/include/mlir/Conversion/Passes.h

@@ -644,28 +644,6 @@ def ConvertIndexToLLVMPass : Pass<"convert-index-to-llvm"> {
   ];
 }
 
-//===----------------------------------------------------------------------===//
-// ConvertIndexToSPIRVPass
-//===----------------------------------------------------------------------===//
-
-def ConvertIndexToSPIRVPass : Pass<"convert-index-to-spirv"> {
-  let summary = "Lower the `index` dialect to the `spirv` dialect.";
-  let description = [{
-    This pass lowers Index dialect operations to SPIR-V dialect operations.
-    Operation conversions are 1-to-1 except for the exotic divides: `ceildivs`,
-    `ceildivu`, and `floordivs`. The index bitwidth will be 32 or 64 as
-    specified by use-64bit-index.
-  }];
-
-  let dependentDialects = ["::mlir::spirv::SPIRVDialect"];
-
-  let options = [
-    Option<"use64bitIndex", "use-64bit-index",
-           "bool", /*default=*/"false",
-           "Use 64-bit integers to convert index types">
-  ];
-}
-
 //===----------------------------------------------------------------------===//
 // LinalgToStandard
 //===----------------------------------------------------------------------===//

mlir/include/mlir/Conversion/Passes.td

@@ -55,13 +55,13 @@ struct SPIRVConversionOptions {
   /// values will be packed into one 32-bit value to be memory efficient.
   bool emulateLT32BitScalarTypes{true};
 
+  /// Use 64-bit integers to convert index types.
+  bool use64bitIndex{false};
+
   /// Whether to enable fast math mode during conversion. If true, various
   /// patterns would assume no NaN/infinity numbers as inputs, and thus there
   /// will be no special guards emitted to check and handle such cases.
   bool enableFastMathMode{false};
-
-  /// Use 64-bit integers when converting index types.
-  bool use64bitIndex{false};
 };
 
 /// Type conversion from builtin types to SPIR-V types for shader interface.
@@ -77,11 +77,6 @@ class SPIRVTypeConverter : public TypeConverter {
   /// Gets the SPIR-V correspondence for the standard index type.
   Type getIndexType() const;
 
-  /// Gets the bitwidth of the index type when converted to SPIR-V.
-  unsigned getIndexTypeBitwidth() const {
-    return options.use64bitIndex ? 64 : 32;
-  }
-
   const spirv::TargetEnv &getTargetEnv() const { return targetEnv; }
 
   /// Returns the options controlling the SPIR-V type converter.

mlir/include/mlir/Dialect/SPIRV/Transforms/SPIRVConversion.h

@@ -24,7 +24,6 @@ add_subdirectory(GPUToROCDL)
 add_subdirectory(GPUToSPIRV)
 add_subdirectory(GPUToVulkan)
 add_subdirectory(IndexToLLVM)
-add_subdirectory(IndexToSPIRV)
 add_subdirectory(LinalgToStandard)
 add_subdirectory(LLVMCommon)
 add_subdirectory(MathToFuncs)