remove a couple of asserts that use RTTI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94068 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineFunction.h

@@ -175,9 +175,6 @@ public:
                                                       AlignOf<Ty>::Alignment));
         MFInfo = new (Loc) Ty(*this);
     }
-
-    assert((void*)dynamic_cast<Ty*>(MFInfo) == (void*)MFInfo &&
-           "Invalid concrete type or multiple inheritence for getInfo");
     return static_cast<Ty*>(MFInfo);
   }