Remove unneeded test in tryCaptureAsConstant.
Remove unneeded test in tryCaptureAsConstant.

It isn't necessary to call hasDefaultArg because we can't rematerialize
a captured variable that is a function parameter, regardless of whether
or not it has a default argument. NFC.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@268318 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang