Fix exporting SARIF files from scan-build on Windows.
Fix exporting SARIF files from scan-build on Windows.

In Perl, -z is defined as checking if a "file has zero size" and makes no mention what it does when given a directory. It looks like the behavior differs across platforms, which is why on Windows the SARIF file was always being deleted.

Patch by Joe Ranieri.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@366941 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang