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b532dd545f
A trace bundle contains many trace files, and, in the case of intel pt, the largest files are often the context switch traces because they are not compressed by default. As a way to improve this, I'm adding a --compact option to the `trace save` command that filters out unwanted processes from the context switch traces. Eventually we can do the same for intel pt traces as well. Differential Revision: https://reviews.llvm.org/D129239