MLIR: Add ReplaceOpAction into DialectConversion and PatternMatch

[mgehre-amd]

Add action to enable listener for RewriterBase::replaceOp, RewriterBase::replaceAllUsesWith and friends.

[cferry-AMD]

replaceAllUsesWith(ValueRange, ValueRange) should also be modified, shouldn't it?

[mgehre-amd]

replaceAllUsesWith(ValueRange, ValueRange)
this calls the replaceAllUsesWith(Value from, Value to), which calls the action here

void replaceAllUsesWith(ValueRange from, ValueRange to) {
    assert(from.size() == to.size() && "incorrect number of replacements");
    for (auto it : llvm::zip(from, to))
      replaceAllUsesWith(std::get<0>(it), std::get<1>(it));
  }

[cferry-AMD]

Thanks for the claraifications, that looks good.

[roberteg16]

Thanks!