eliminate code related to --no-ir-gen

src/IceOperand.h

Index: src/IceOperand.h
diff --git a/src/IceOperand.h b/src/IceOperand.h
index 7398f73a754670a1a2d0cacd536996dd906e58d5..67ff09fef9bd1ee934910378b42346112cf5546d 100644
--- a/src/IceOperand.h
+++ b/src/IceOperand.h
@@ -166,8 +166,6 @@ public:
 
   static ConstantPrimitive *create(GlobalContext *Ctx, Type Ty,
                                    PrimType Value) {
-    assert(!Ctx->isIRGenerationDisabled() &&
-           "Attempt to build primitive constant when IR generation disabled");
     return new (Ctx->allocate<ConstantPrimitive>())
         ConstantPrimitive(Ty, Value);
   }
@@ -279,8 +277,6 @@ class ConstantRelocatable : public Constant {
 public:
   static ConstantRelocatable *create(GlobalContext *Ctx, Type Ty,
                                      const RelocatableTuple &Tuple) {
-    assert(!Ctx->isIRGenerationDisabled() &&
-           "Attempt to build relocatable constant when IR generation disabled");
     return new (Ctx->allocate<ConstantRelocatable>()) ConstantRelocatable(
         Ty, Tuple.Offset, Tuple.Name, Tuple.SuppressMangling);
   }
@@ -320,8 +316,6 @@ class ConstantUndef : public Constant {
 
 public:
   static ConstantUndef *create(GlobalContext *Ctx, Type Ty) {
-    assert(!Ctx->isIRGenerationDisabled() &&
-           "Attempt to build undefined constant when IR generation disabled");
     return new (Ctx->allocate<ConstantUndef>()) ConstantUndef(Ty);
   }