Don't leak CXStrings for replacement fix-its in c-index-test.

The loop body used to contain a switch statement; it looks like r96685 replaced
that with an if/else if/else but accidentally left one of the three break
statements from the switch behind, skipping the clang_disposeString() call
for replacements (and the rest of the loop too, which apparently doesn't make
a differences for the test cases we have).

r96685: http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20100215/027754.html

This too might possibly the last leak in clang (PR19521).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208483 91177308-0d34-0410-b5e6-96231b3b80d8
Follow-up to r208481: Free all default arguments, not just the first one.

Also add test coverage for this case.  Found by Richard Smith!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208484 91177308-0d34-0410-b5e6-96231b3b80d8