Alternative (to r216344) fix of gcc -Wpedantic.
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: 0ff597fd157e6f4fc38580e8d64ab130330d2411@218048 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,apple/swift-llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,dslab-epfl/asap,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,dslab-epfl/asap,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,dslab-epfl/asap,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,apple/swift-llvm,apple/swift-llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,apple/swift-llvm,dslab-epfl/asap,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,dslab-epfl/asap