[mlir][bufferization][NFC] Clean up code (#78594)

Clean up code and remove dead code.

Author: matthias-springer

mlir/include/mlir/Dialect/Bufferization/IR/BufferizableOpInterface.h

@@ -375,9 +375,6 @@ struct BufferizationOptions {
   SmallVector<AnalysisStateInitFn> stateInitializers;
 };
 
-/// Return `true` if the given value is a BlockArgument of a func::FuncOp.
-bool isFunctionArgument(Value value);
-
 /// Traversal parameters for `findValueInReverseUseDefChain`.
 struct TraversalConfig {
   /// Specifies if leaves (that do not have further OpOperands to follow)

mlir/lib/Dialect/Bufferization/IR/BufferizableOpInterface.cpp

@@ -759,13 +759,6 @@ LogicalResult BufferizationOptions::createMemCpy(OpBuilder &b, Location loc,
 // Bufferization-specific IRMapping support with debugging.
 //===----------------------------------------------------------------------===//
 
-bool bufferization::isFunctionArgument(Value value) {
-  auto bbArg = llvm::dyn_cast<BlockArgument>(value);
-  if (!bbArg)
-    return false;
-  return isa<func::FuncOp>(bbArg.getOwner()->getParentOp());
-}
-
 BaseMemRefType bufferization::getMemRefType(Value value,
                                             const BufferizationOptions &options,
                                             MemRefLayoutAttrInterface layout,

mlir/lib/Dialect/Bufferization/Transforms/BufferDeallocationSimplification.cpp

@@ -240,13 +240,6 @@ struct RemoveRetainedMemrefsGuaranteedToNotAlias
   LogicalResult matchAndRewrite(DeallocOp deallocOp,
                                 PatternRewriter &rewriter) const override {
     SmallVector<Value> newRetainedMemrefs, replacements;
-    Value falseValue;
-    auto getOrCreateFalse = [&]() -> Value {
-      if (!falseValue)
-        falseValue = rewriter.create<arith::ConstantOp>(
-            deallocOp.getLoc(), rewriter.getBoolAttr(false));
-      return falseValue;
-    };
 
     for (auto retainedMemref : deallocOp.getRetained()) {
       if (potentiallyAliasesMemref(aliasAnalysis, deallocOp.getMemrefs(),
@@ -256,7 +249,8 @@ struct RemoveRetainedMemrefsGuaranteedToNotAlias
         continue;
       }
 
-      replacements.push_back(getOrCreateFalse());
+      replacements.push_back(rewriter.create<arith::ConstantOp>(
+          deallocOp.getLoc(), rewriter.getBoolAttr(false)));
     }
 
     if (newRetainedMemrefs.size() == deallocOp.getRetained().size())