profile: add logging on failure
profile: add logging on failure

Add logging to report any failures that may occur on calls to libdl.  Without
this, it is difficult to identify the actual problem if the test fails.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@209097 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