Fix errors in the benchmark result.
Fix errors in the benchmark result.

I was mixing 1000 and 1024 when calculating file sizes in MiB or
in GiB.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@296155 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld