Convert more code to use new style casts

Eliminate old style casts from value.h


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@696 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Bytecode/Reader/ReaderInternals.h

@@ -129,8 +129,7 @@ struct BBPlaceHolderHelper : public BasicBlock {
 
 struct MethPlaceHolderHelper : public Method {
   MethPlaceHolderHelper(const Type *Ty) 
-    : Method((const MethodType*)Ty) {
-    assert(Ty->isMethodType() && "Method placeholders must be method types!");
+    : Method(cast<const MethodType>(Ty)) {
   }
 };