[Bug 207735] www/firefox: DTRACE no longer works since 41.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207735

            Bug ID: 207735
           Summary: www/firefox: DTRACE no longer works since 41.0
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
                CC: freebsd-dtrace at FreeBSD.org
            Blocks: 203384
             Flags: maintainer-feedback?(gecko at FreeBSD.org)
          Assignee: gecko at FreeBSD.org

dtrace fails to install probes with long names e.g.,

_ZL19NewArrayTryUseGroupILj4294967295EEP8JSObjectPN2js16ExclusiveContextEN2JS6HandleIPNS2_11ObjectGroupEEEmNS2_13NewObjectKindEb

Steps to reproduce:
1. Build www/firefox with DTRACE=on
2. kldload dtraceall or kldload sdt
3. Start firefox
4. Check dtrace -l output

Actual result:
$ dtrace -l | fgrep javascript
<empty>

Expected result:
$ dtrace -l | fgrep javascript
33327 javascript65009                js
_ZN2js13ExecuteKernelEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectRKNS2_5ValueESB_NS_11ExecuteTypeENS_16AbstractFramePtrEPS9_
execute-done
33328 javascript65009                js
_ZN2js13ExecuteKernelEP9JSContextN2JS6HandleIP8JSScriptEER8JSObjectRKNS2_5ValueESB_NS_11ExecuteTypeENS_16AbstractFramePtrEPS9_
execute-start
33329 javascript65009                js
_ZN2js16InterpreterFrame8prologueEP9JSContext function-entry
...

Bisecting first bad:
https://hg.mozilla.org/mozilla-central/rev/3a994e364343


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203384
[Bug 203384] www/firefox: upgrade to 41
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