DebugInfo: Gut DIExpression

Completely gut `DIExpression`, turning it into a simple wrapper around
`MDExpression *`.  There are two bits of magic left:

  - It's constructed from `const MDExpression*` but convertible to
    `MDExpression*`.
  - It's default-constructed to `nullptr`.

Otherwise, it should behave quite like a raw pointer.  Once I've done
the same to the rest of the `DIDescriptor` subclasses, I'll come back to
delete them entirely (and update call sites as necessary to deal with
the missing magic).

llvm-svn: 234832

1 files changed, 3 insertions, 3 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 10e399530d6..99081ef2c38 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -679,9 +679,9 @@ static bool emitDebugValueComment(const MachineInstr *MI, AsmPrinter &AP) {
   OS << V.getName();
 
   DIExpression Expr = MI->getDebugExpression();
-  if (Expr.isBitPiece())
-    OS << " [bit_piece offset=" << Expr.getBitPieceOffset()
-       << " size=" << Expr.getBitPieceSize() << "]";
+  if (Expr->isBitPiece())
+    OS << " [bit_piece offset=" << Expr->getBitPieceOffset()
+       << " size=" << Expr->getBitPieceSize() << "]";
   OS << " <- ";
 
   // The second operand is only an offset if it's an immediate.