Fix build broken by r323641
Fix build broken by r323641

The call to ScopedPrinter::printNumber with size_t argument was
ambiguous (I think) on 32-bit builds. Explicitly cast to a 64-bit int to
avoid this.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@323642 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 1b7ed97142eaacbc01fca0324a9cc553517bc6bc)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm