Alternative (to r216344) fix of gcc -Wpedantic.

As suggested by David Blaikie, this may be easier to read.

The original warning was:

../tools/llvm-cov/llvm-cov.cpp:53:49: error: ISO C++ forbids zero-size array 'argv' [-Werror=pedantic]
       std::string Invocation(std::string(argv[0]) + " " + argv[1]);

It seems to be the case that GCC's warning gets confused and thinks
'argv' is a declaration here. GCC bugzilla issue #61259.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218048 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-cov/llvm-cov.cpp

@@ -50,7 +50,7 @@ int main(int argc, const char **argv) {
       func = gcov_main;
 
     if (func) {
-      std::string Invocation(std::string() + argv[0] + " " + argv[1]);
+      std::string Invocation = std::string(argv[0]) + " " + argv[1];
       argv[1] = Invocation.c_str();
       return func(argc - 1, argv + 1);
     }