Add support for user-provided hooks and environment variable reads to the cmd_line tool property.

Used like this: (cmd_line "$CALL(MyHook) --option -o $ENV(VARIABLE) $CALL(AnotherHook)")
Also works with case expressions.

Hook declarations are auto-generated, the definitions should be provided by the user
(just drop a .cpp file in the tools/llvmc2 directory).

Hooks should live in the "hooks" namespace and have type std::string hooks::Hook(void).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51732 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvmc2/AutoGenerated.cpp

@@ -18,6 +18,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/CommandLine.h"
 
+#include <cstdlib>
 #include <stdexcept>
 
 using namespace llvm;