For the asan_symbolize.py script, use addr2line as the default system

symbolizer on FreeBSD too.  This allows the asan-symbolize-bad-path.cc
test to succeed.

llvm-svn: 256578

compiler-rt/lib/asan/scripts/asan_symbolize.py

@@ -271,7 +271,7 @@ def BreakpadSymbolizerFactory(binary):
 def SystemSymbolizerFactory(system, addr, binary):
   if system == 'Darwin':
     return DarwinSymbolizer(addr, binary)
-  elif system == 'Linux':
+  elif system == 'Linux' or system == 'FreeBSD':
     return Addr2LineSymbolizer(binary)