[NFC][clang] Inclusive language: rename master variable to controller in debug-info tests

[NFC] As part of using inclusive language within the llvm project, this patch
replaces master with controller in these tests.

Reviewed By: rjmccall

Differential Revision: https://reviews.llvm.org/D114108

GitOrigin-RevId: ad501054f1b5ce0aca47c931aa03a22706e4ff8d
1 file changed