[profile] Further cleanup/refactor file handling code
[profile] Further cleanup/refactor file handling code

Also get rid of the redundant strncpy calls.


git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@270730 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt