remove propogation when fir.declare is removed

Author: SusanTan

flang/lib/Optimizer/CodeGen/PreCGRewrite.cpp

@@ -281,20 +281,6 @@ class DeclareOpConversion : public mlir::OpRewritePattern<fir::DeclareOp> {
   matchAndRewrite(fir::DeclareOp declareOp,
                   mlir::PatternRewriter &rewriter) const override {
     if (!preserveDeclare) {
-      auto memrefOp = declareOp.getMemref().getDefiningOp();
-      if (!memrefOp) {
-        rewriter.replaceOp(declareOp, declareOp.getMemref());
-        return mlir::success();
-      }
-
-      // attach metadatas from the fir.declare to its memref (if it's an
-      // operation)
-      mlir::NamedAttrList elidedAttrs =
-          mlir::NamedAttrList{memrefOp->getAttrs()};
-      for (const mlir::NamedAttribute &attr : declareOp->getAttrs())
-        if (!elidedAttrs.get(attr.getName()))
-          memrefOp->setAttr(attr.getName(), attr.getValue());
-
       rewriter.replaceOp(declareOp, declareOp.getMemref());
       return mlir::success();
     }

flang/test/Fir/declare-codegen.fir

@@ -61,10 +61,5 @@ func.func @test_local_memref() {
   %1 = fir.declare %0 {uniq_name = "local_array_declare", acc.declare = #acc.declare<dataClause = acc_create>} : (!fir.ref<!fir.array<10xi32>>) -> !fir.ref<!fir.array<10xi32>>
   return
 }
-// NODECL-LABEL: func.func @test_local_memref() {
-  
-// Note: the uniq_name is not attached of fir.declare is not preserved because it conflicts with the uniq_name of the memref
-// NODECL: fir.alloca{{.*}}{acc.declare = #acc.declare<dataClause = acc_create>, uniq_name = "local_array"}
-
 // DECL-LABEL: func.func @test_local_memref() {
 // DECL: fircg.ext_declare{{.*}}{acc.declare = #acc.declare<dataClause = acc_create>, uniq_name = "local_array_declare"}