llvm-cov: Follow LLVM naming conventions

This renames a few things that are using an unusual naming convention.

llvm-svn: 220929
diff --git a/llvm/tools/llvm-cov/TestingSupport.cpp b/llvm/tools/llvm-cov/TestingSupport.cpp
index 9641764..aa07a79 100644
--- a/llvm/tools/llvm-cov/TestingSupport.cpp
+++ b/llvm/tools/llvm-cov/TestingSupport.cpp
@@ -21,7 +21,7 @@
 using namespace llvm;
 using namespace object;
 
-int convert_for_testing_main(int argc, const char **argv) {
+int convertForTestingMain(int argc, const char *argv[]) {
   sys::PrintStackTraceOnErrorSignal();
   PrettyStackTraceProgram X(argc, argv);
   llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.