llvm-profdata: Check for bad data in the show command

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204573 91177308-0d34-0410-b5e6-96231b3b80d8
ARM: no need to update SplatBits as it is not used

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204575 91177308-0d34-0410-b5e6-96231b3b80d8