[Bug 206039] [exp-run] using llvm libunwind

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206039

            Bug ID: 206039
           Summary: [exp-run] using llvm libunwind
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: emaste at freebsd.org
                CC: freebsd-ports-bugs at FreeBSD.org

Created attachment 165271
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=165271&action=edit
patch 1: build infrastructure

I am planning to import LLVM's libunwind for exception unwinding and would like
to request an exp-run. This is probably a bigger run-time than build-time
concern, in fact, but it's important to at least start here and make sure that
it doesn't introduce a build breakage.

Currently two patches are required:
1. LLVM-libunwind build infrastructure
   (attached as llvm-libunwind-x86-arm.diff and also
https://reviews.freebsd.org/D4787)
2. enable LLVM-libunwind on x86 and arm by default
   (attached as llvm-libunwind.diff)

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