Replace uses of %T with %t in from previous frontend test differential

After committing a change I had made to a few frontend tests, it was pointed
out to me that %T is being deprecated in LLVM in favor of %t. This change
simply converts usages of %T to %t while maintaining the integrity of the test.

Previous revision where this discussion took place:
https://reviews.llvm.org/D50563

Differential Revision: https://reviews.llvm.org/D57592

Patch from Justice Adams <justice.adams@sony.com>!

llvm-svn: 352971