Use libunwind to find local symbol address on FreeBSD

Similar to Linux.
The LLVM fallback is currently not working on FreeBSD for some reason.

Fix: #20798

src/debuginfo.cpp

@@ -734,7 +734,7 @@ static void get_function_name_and_base(const object::ObjectFile *object, bool in
     bool needs_name = name && (!*name || untrusted_dladdr);
     // Try platform specific methods first since they are usually faster
     if (needs_saddr) {
-#if defined(_OS_LINUX_) && !defined(JL_DISABLE_LIBUNWIND)
+#if (defined(_OS_LINUX_) || defined(_OS_FREEBSD_)) && !defined(JL_DISABLE_LIBUNWIND)
         unw_proc_info_t pip;
         if (unw_get_proc_info_by_ip(unw_local_addr_space, pointer, &pip, NULL) == 0) {
             *saddr = (void*)pip.start_ip;

test/cmdlineargs.jl

@@ -423,12 +423,7 @@ end
 for precomp in ("yes", "no")
     bt = readstring(pipeline(ignorestatus(`$(Base.julia_cmd()) --startup-file=no --precompiled=$precomp
         -E 'include("____nonexistent_file")'`), stderr=catcmd))
-    if (is_bsd() && !is_apple()) && precomp == "yes"
-        # FIXME: #20798 (FreeBSD)
-        @test_broken contains(bt, "include_from_node1(::Module, ::String) at $(joinpath(".", "loading.jl"))")
-    else
-        @test contains(bt, "include_from_node1(::Module, ::String) at $(joinpath(".", "loading.jl"))")
-    end
+    @test contains(bt, "include_from_node1(::Module, ::String) at $(joinpath(".", "loading.jl"))")
     lno = match(r"at \.[\/\\]loading\.jl:(\d+)", bt)
     @test length(lno.captures) == 1
     @test parse(Int, lno.captures[1]) > 0