trace2: convert ctx.thread_name from strbuf to pointer

Convert the `tr2tls_thread_ctx.thread_name` field from a `strbuf`
to a "const char*" pointer.

The `thread_name` field is a constant string that is constructed when
the context is created.  Using a (non-const) `strbuf` structure for it
caused some confusion in the past because it implied that someone
could rename a thread after it was created.  That usage was not
intended.  Change it to a const pointer to make the intent more clear.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

0 files changed, 0 insertions, 0 deletions