[AsmWriter] Remove redundant cast<>s. NFC.

llvm-svn: 290283
diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
index 5c104f6..83edaad 100644
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -3003,7 +3003,7 @@
     }
 
     Operand = CI->getCalledValue();
-    FunctionType *FTy = cast<FunctionType>(CI->getFunctionType());
+    FunctionType *FTy = CI->getFunctionType();
     Type *RetTy = FTy->getReturnType();
     const AttributeSet &PAL = CI->getAttributes();
 
@@ -3040,7 +3040,7 @@
 
   } else if (const InvokeInst *II = dyn_cast<InvokeInst>(&I)) {
     Operand = II->getCalledValue();
-    FunctionType *FTy = cast<FunctionType>(II->getFunctionType());
+    FunctionType *FTy = II->getFunctionType();
     Type *RetTy = FTy->getReturnType();
     const AttributeSet &PAL = II->getAttributes();