Georges Basile Stavracas Neto authored Sep 07, 2018 and Philip Chimento committed Sep 23, 2018

In MozJS 60, only using entry.label() is not enough to give
meaningful Sysprof entries, since it might be an empty string
in various cases. This gives many empty entries in Sysprof,
making the profiler not as useful.

As per upstream MozJS, in version 60, the final string is a
combination of entry.label() and entry.dynamicString(). In [1],
however, the dynamic string is conditionally added depending
on a privacy toggle - which is not really the case with GJS
since enabling the profiler isn't possible without a large
control over the software stack, and opting in.

Thus, use entry.dynamicLabel() as an additional source of
information when saving the profiling labels, with enough
care to not allocate new strings while there.

[1] https://hg.mozilla.org/releases/mozilla-esr60/rev/768e500ad190