Fix tablegen's PrintFatalError function to run registered file

Fix tablegen's PrintFatalError function to run registered file
cleanups.

Also, change code in tablegen which printed a message and then called
"exit(1)" to use PrintFatalError, instead.

This fixes instances where an empty output file was left behind after
a failed tablegen invocation, which would confuse subsequent ninja
runs into not attempting to rebuild.

Differential Revision: http://reviews.llvm.org/D9608

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237058 91177308-0d34-0410-b5e6-96231b3b80d8