[silgen] Delete dead code.

We only use the other emitCheckedCastBranchOld so this is dead.

rdar://29791263

Author: gottesmm

lib/SILGen/SILGenDynamicCast.cpp

@@ -328,34 +328,6 @@ namespace {
 
     bool isOperandIndirect() const { return Strategy == CastStrategy::Address; }
 
-    ManagedValue emitOperand(Expr *operand) {
-      AbstractionPattern mostGeneral =
-          SGF.SGM.Types.getMostGeneralAbstraction();
-      auto &origSourceTL = SGF.getTypeLowering(mostGeneral, SourceType);
-
-      SGFContext ctx;
-
-      std::unique_ptr<TemporaryInitialization> temporary;
-      if (isOperandIndirect() && SGF.silConv.useLoweredAddresses()) {
-        temporary = SGF.emitTemporary(Loc, origSourceTL);
-        ctx = SGFContext(temporary.get());
-      }
-
-      auto result =
-          SGF.emitRValueAsOrig(operand, mostGeneral, origSourceTL, ctx);
-
-      if (isOperandIndirect() && SGF.silConv.useLoweredAddresses()) {
-        // Force the result into the temporary if it's not already there.
-        if (!result.isInContext()) {
-          result.forwardInto(SGF, Loc, temporary->getAddress());
-          temporary->finishInitialization(SGF);
-        }
-        return temporary->getManagedAddress();
-      }
-
-      return result;
-    }
-
     RValue emitUnconditionalCast(ManagedValue operand, SGFContext ctx) {
       // The cast functions don't know how to work with anything but
       // the most general possible abstraction level.
@@ -542,17 +514,6 @@ namespace {
   };
 } // end anonymous namespace
 
-void SILGenFunction::emitCheckedCastBranchOld(
-    SILLocation loc, Expr *source, Type targetType, SGFContext ctx,
-    llvm::function_ref<void(ManagedValue)> handleTrue,
-    llvm::function_ref<void()> handleFalse, ProfileCounter TrueCount,
-    ProfileCounter FalseCount) {
-  CheckedCastEmitterOld emitter(*this, loc, source->getType(), targetType);
-  ManagedValue operand = emitter.emitOperand(source);
-  emitter.emitConditional(operand, CastConsumptionKind::TakeAlways, ctx,
-                          handleTrue, handleFalse, TrueCount, FalseCount);
-}
-
 void SILGenFunction::emitCheckedCastBranchOld(
     SILLocation loc, ConsumableManagedValue src, Type sourceType,
     CanType targetType, SGFContext ctx,

lib/SILGen/SILGenFunction.h

@@ -1486,20 +1486,6 @@ class LLVM_LIBRARY_VISIBILITY SILGenFunction
       ProfileCounter TrueCount = ProfileCounter(),
       ProfileCounter FalseCount = ProfileCounter());
 
-  /// A form of checked cast branch that uses the old non-ownership preserving
-  /// semantics.
-  ///
-  /// The main difference is that this code does not pass the old argument as a
-  /// block argument in the failure case. This causes values to be double
-  /// consumed.
-  void
-  emitCheckedCastBranchOld(SILLocation loc, Expr *source, Type targetType,
-                           SGFContext ctx,
-                           llvm::function_ref<void(ManagedValue)> handleTrue,
-                           llvm::function_ref<void()> handleFalse,
-                           ProfileCounter TrueCount = ProfileCounter(),
-                           ProfileCounter FalseCount = ProfileCounter());
-
   /// \brief Emit a conditional checked cast branch, starting from an
   /// expression.  Terminates the current BB.
   ///