Verifier: Remove unnecessary double-checks

Turns out `visitIntrinsicFunctionCall()` descends into all operands
already, so explicitly descending in `visitDbgIntrinsic()` (part of
r232296) isn't useful.

Updating a testcase that doesn't really need `-verify-debug-info` (since
r231082) as confirmation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232408 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/Verifier.cpp

@@ -3030,10 +3030,6 @@ void Verifier::visitDbgIntrinsic(StringRef Kind, DbgIntrinsicTy &DII) {
   Assert(isa<MDExpression>(DII.getRawExpression()),
          "invalid llvm.dbg." + Kind + " intrinsic expression", &DII,
          DII.getRawExpression());
-
-  // Don't call visitMDNode(), since that will recurse through operands.
-  visitMDLocalVariable(*DII.getVariable());
-  visitMDExpression(*DII.getExpression());
 }
 
 void DebugInfoVerifier::verifyDebugInfo() {