[mlir][Transforms] Dialect conversion: Turn LLVM_DEPRECATED into comments (#122073)

Some functions of the deprecated 1:N dialect conversion were marked as
`LLVM_DEPRECATED`. This caused compilation warnings because there are
still test cases of the 1:N dialect conversion framework. (These test
cases will be deleted at the same time when the 1:N driver is deleted.)

Author: matthias-springer

mlir/include/mlir/Dialect/SCF/Transforms/Patterns.h

@@ -68,8 +68,7 @@ void populateSCFStructuralTypeConversionTarget(
 /// applyPartialOneToNConversion.
 /// FIXME: The 1:N dialect conversion is deprecated and will be removed soon.
 /// 1:N support has been added to the regular dialect conversion driver.
-LLVM_DEPRECATED("Use populateSCFStructuralTypeConversions() instead",
-                "populateSCFStructuralTypeConversions")
+/// Use populateSCFStructuralTypeConversions() instead.
 void populateSCFStructuralOneToNTypeConversions(
     const TypeConverter &typeConverter, RewritePatternSet &patterns);
 

mlir/include/mlir/Transforms/OneToNTypeConversion.h

@@ -123,9 +123,7 @@ class OneToNPatternRewriter : public PatternRewriter {
   /// (i.e., the converted types must be the same as the types of the new
   /// values).
   /// FIXME: The 1:N dialect conversion is deprecated and will be removed soon.
-  /// 1:N support has been added to the regular dialect conversion driver.
-  LLVM_DEPRECATED("Use replaceOpWithMultiple() instead",
-                  "replaceOpWithMultiple")
+  /// Use replaceOpWithMultiple() instead.
   void replaceOp(Operation *op, ValueRange newValues,
                  const OneToNTypeMapping &resultMapping);
   using PatternRewriter::replaceOp;
@@ -260,8 +258,7 @@ class OneToNOpConversionPattern : public OneToNConversionPattern {
 /// only "partial").
 /// FIXME: The 1:N dialect conversion is deprecated and will be removed soon.
 /// 1:N support has been added to the regular dialect conversion driver.
-LLVM_DEPRECATED("Use applyPartialConversion() instead",
-                "applyPartialConversion")
+/// Use applyPartialConversion() instead.
 LogicalResult
 applyPartialOneToNConversion(Operation *op, TypeConverter &typeConverter,
                              const FrozenRewritePatternSet &patterns);
@@ -272,9 +269,7 @@ applyPartialOneToNConversion(Operation *op, TypeConverter &typeConverter,
 /// used with the 1:N dialect conversion.
 /// FIXME: The 1:N dialect conversion is deprecated and will be removed soon.
 /// 1:N support has been added to the regular dialect conversion driver.
-LLVM_DEPRECATED(
-    "Use populateFunctionOpInterfaceTypeConversionPattern() instead",
-    "populateFunctionOpInterfaceTypeConversionPattern")
+/// Use populateFunctionOpInterfaceTypeConversionPattern() instead.
 void populateOneToNFunctionOpInterfaceTypeConversionPattern(
     StringRef functionLikeOpName, const TypeConverter &converter,
     RewritePatternSet &patterns);