Remove duplicated header contents, NFC

It looks like InstrProfiling.h was the victim of a bad merge. The header
guards in the file prevented the build from blowing up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266822 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed