[Kaleidoscope] Fix incorrect use of reinterpret_cast.

Thanks to Dave Blaikie for catching this.

llvm-svn: 235543
diff --git a/llvm/examples/Kaleidoscope/Chapter7/toy.cpp b/llvm/examples/Kaleidoscope/Chapter7/toy.cpp
index acf21f89..b1a41fa 100644
--- a/llvm/examples/Kaleidoscope/Chapter7/toy.cpp
+++ b/llvm/examples/Kaleidoscope/Chapter7/toy.cpp
@@ -716,7 +716,7 @@
     // This assume we're building without RTTI because LLVM builds that way by
     // default.  If you build LLVM with RTTI this can be changed to a
     // dynamic_cast for automatic error checking.
-    VariableExprAST *LHSE = reinterpret_cast<VariableExprAST *>(LHS);
+    VariableExprAST *LHSE = static_cast<VariableExprAST *>(LHS);
     if (!LHSE)
       return ErrorV("destination of '=' must be a variable");
     // Codegen the RHS.