[mlir][vector] Linearization: push 'bit width' logic out of patterns

mlir/include/mlir/Dialect/Vector/Transforms/VectorRewritePatterns.h

@@ -392,18 +392,24 @@ void populateVectorNarrowTypeRewritePatterns(RewritePatternSet &patterns,
 void populateVectorTransposeNarrowTypeRewritePatterns(
     RewritePatternSet &patterns, PatternBenefit benefit = 1);
 
-/// Populates patterns for ND vectors (N >= 2) linearization and sets up the
-/// provided ConversionTarget with the appropriate legality configuration for
-/// the ops to get converted properly.
-void populateVectorLinearizeTypeConversionsAndLegality(
-    TypeConverter &typeConverter, RewritePatternSet &patterns,
-    ConversionTarget &target, unsigned targetBitWidth);
-
-/// Populates patterns for linearizing ND (N >= 2) vector operations to 1D
-/// vector shuffle operations.
-void populateVectorLinearizeShuffleLikeOpsPatterns(
-    const TypeConverter &typeConverter, RewritePatternSet &patterns,
-    ConversionTarget &target, unsigned targetBitWidth);
+/// Populate `typeConverter` and `conversionTarget` with the definition of
+/// legal types and operations, for the specific case where vectors with
+/// trailing dimensions of size greater than `targetBitWidth` are legal.
+void populateVectorLinearizeBitWidthTargetAndConverter(
+    TypeConverter &typeConverter, ConversionTarget &conversionTarget,
+    unsigned targetBitWidth);
+
+/// Populates `patterns` for ND vector (N >= 2) linearization. Patterns for
+/// converting ConstantLike, Vectorizable, and vector::BitCast.
+void populateVectorLinearizeBasePatterns(const TypeConverter &,
+                                         RewritePatternSet &patterns,
+                                         const ConversionTarget &);
+
+/// Populates `patterns` for linearizing ND (N >= 2) vector operations
+/// to 1D vector shuffle operations.
+void populateVectorLinearizeShuffleLikeOpsPatterns(const TypeConverter &,
+                                                   RewritePatternSet &patterns,
+                                                   const ConversionTarget &);
 
 } // namespace vector
 } // namespace mlir