[DebugInfoMetadata] Refactor DIExpression::prepend constants (NFC)

Refactor DIExpression::With* into a flag enum in order to be less
error-prone to use (as discussed on D60866).

Patch by Djordje Todorovic.

Differential Revision: https://reviews.llvm.org/D61943

llvm-svn: 361137

2 files changed, 3 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index b4530f9bc30..0758a31ec99 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -7946,9 +7946,8 @@ void SelectionDAG::salvageDebugInfo(SDNode &N) {
         // DIExpression, we need to mark the expression with a
         // DW_OP_stack_value.
         auto *DIExpr = DV->getExpression();
-        DIExpr = DIExpression::prepend(DIExpr, DIExpression::NoDeref, Offset,
-                                       DIExpression::NoDeref,
-                                       DIExpression::WithStackValue);
+        DIExpr =
+            DIExpression::prepend(DIExpr, DIExpression::StackValue, Offset);
         SDDbgValue *Clone =
             getDbgValue(DV->getVariable(), DIExpr, N0.getNode(), N0.getResNo(),
                         DV->isIndirect(), DV->getDebugLoc(), DV->getOrder());
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index e76628435f7..e1c6b18a1bd 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -1363,7 +1363,7 @@ static void processDbgDeclares(FunctionLoweringInfo *FuncInfo) {
 
       DIExpression *Expr = DI->getExpression();
       if (Offset.getBoolValue())
-        Expr = DIExpression::prepend(Expr, DIExpression::NoDeref,
+        Expr = DIExpression::prepend(Expr, DIExpression::ApplyOffset,
                                      Offset.getZExtValue());
       MF->setVariableDbgInfo(DI->getVariable(), Expr, FI, DI->getDebugLoc());
     }