Let ubsan search UBSAN_SYMBOLIZER_PATH for llvm-symbolizer

https://reviews.llvm.org/D27375

llvm-svn: 300692

compiler-rt/lib/ubsan/ubsan_flags.cc

@@ -45,6 +45,7 @@ void InitializeFlags() {
     CommonFlags cf;
     cf.CopyFrom(*common_flags());
     cf.print_summary = false;
+    cf.external_symbolizer_path = GetEnv("UBSAN_SYMBOLIZER_PATH");
     OverrideCommonFlags(cf);
   }