[PATCH] Perform wildcard expansion in Process::GetArgumentVector on Windows (PR17098)

[Hans Wennborg]

> The code looks fine but it needs tests.

We don't have anything exercising this code in LLVM, but I can test it from Clang with the lit test below. What do you think?

// Clang does wildcard expansion on Windows. On other OSs, it's done by the shell.
// REQUIRES: system-windows

// RUN: %clang -c -### %S/Inputs/wildcard*.c 2>&1 | FileCheck %s
// CHECK: wildcard1.c
// CHECK: wildcard2.c

http://reviews.llvm.org/D4529