Rename new lto2 tool as lto.
lto2->lto

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them back to registers!

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this still compiles on windows - I can't test!

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other) feature information. The workaround is inelegant and could be cleaned up
if this information were available some other way (say, in the IR).

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With this more general way, -native and -native-cbe options are handled too.

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found, this ensures that messages like "Found gcc" end up on stdout where they
belong.

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when bugpoint is running passes in a child process.

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It can be handy to have all information about options gathered in a single place
to provide an overview of all supported options. This patch allows the following:

def Options : OptionList<[
(switch_option "E", (help "Help string")),
(alias_option "quiet", "q")
...
]>;

Tool-specific option properties (like 'append_cmd') have (obviously) no meaning in
this context, so the only properties that are allowed are 'help' and 'required'.

See usage example in examples/Clang.td.

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The following is now allowed:

    (case (not_empty "o"), do_something, ...)

This didn't work previously because "-o" is built-in.

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For instance, the following command:

    llvmc2 -E hello.c

now generates a file with the correct suffix (hello.i).

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