Clang: Preamble files are not deleted

I get a huge amount of »preamble-*.pch« files in my %TEMP% folder.

If i remove a ›;‹ in a source file such a file is created, when i put the ›;‹ back and save the file another one is created.
After a few hours of work, i have gigabytes of these files in my %TEMP% and i have to remove them manually.

Built from wip/clang trunk and llvm/clang trunk from a few days ago.