Retype from unsigned to CallingConv::ID accordingly. Approved by Bob Wilson.

llvm-svn: 80773
diff --git a/llvm/lib/VMCore/Instructions.cpp b/llvm/lib/VMCore/Instructions.cpp
index e4cf5f4..a12075f 100644
--- a/llvm/lib/VMCore/Instructions.cpp
+++ b/llvm/lib/VMCore/Instructions.cpp
@@ -45,10 +45,10 @@
   I.setPointer(C);
   I.setInt(isa<CallInst>(C));
 }
-unsigned CallSite::getCallingConv() const {
+CallingConv::ID CallSite::getCallingConv() const {
   CALLSITE_DELEGATE_GETTER(getCallingConv());
 }
-void CallSite::setCallingConv(unsigned CC) {
+void CallSite::setCallingConv(CallingConv::ID CC) {
   CALLSITE_DELEGATE_SETTER(setCallingConv(CC));
 }
 const AttrListPtr &CallSite::getAttributes() const {