add exception handling to upscale_relperm_benchmark

benchmarks/upscale_relperm_benchmark.cpp

@@ -220,6 +220,7 @@ static void inflate (const unsigned char* input, const int size, stringstream& o
 }
 
 int main(int varnum, char** vararg)
+try
 {
 
     // Variables used for timing/profiling:
@@ -1776,3 +1777,7 @@ int main(int varnum, char** vararg)
 
     return 0;
 }
+catch (const std::exception &e) {
+    std::cerr << e.what() << "\n";
+    usageandexit();
+}