Fix builds on Windows broken in r264598.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264618 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetCallingConv.h

@@ -18,7 +18,7 @@
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/MathExtras.h"
 #include <string>
-#include <limits>
+#include <climits>
 
 namespace llvm {
 
@@ -142,7 +142,7 @@ namespace ISD {
     /// Index original Function's argument.
     unsigned OrigArgIndex;
     /// Sentinel value for implicit machine-level input arguments.
-    static const unsigned NoArgIndex = std::numeric_limits<uint32_t>::max();
+    static const unsigned NoArgIndex = UINT_MAX;
 
     /// Offset in bytes of current input value relative to the beginning of
     /// original argument. E.g. if argument was splitted into four 32 bit