SILGen: Fix ownership violation in visitUnderlyingToOpaqueExpr()

Author: slavapestov

lib/SILGen/SILGenExpr.cpp

@@ -2129,11 +2129,9 @@ RValue RValueEmitter::visitUnderlyingToOpaqueExpr(UnderlyingToOpaqueExpr *E,
   if (value.getType() == opaqueTL.getLoweredType())
     return RValue(SGF, E, value);
 
-  auto cast = SGF.B.createUncheckedReinterpretCast(E, value.forward(SGF),
-                                                   opaqueTL.getLoweredType());
-  value = SGF.emitManagedRValueWithCleanup(cast);
-
-  return RValue(SGF, E, value);
+  auto cast = SGF.B.createUncheckedBitCast(E, value,
+                                           opaqueTL.getLoweredType());
+  return RValue(SGF, E, cast);
 }
 
 VarargsInfo Lowering::emitBeginVarargs(SILGenFunction &SGF, SILLocation loc,