[PATCH] Make an llvm-config for cross-compilation

[Ray Donnelly]

Hi,

I'd like you to consider the attached patch. I'm sure there needs to
be some discussion about it, and, if the idea and approach are deemed
ok to merge, then I might need some hand-holding for implementing the
same thing under the cmake build system (if llvm cross compilation is
a supported feature of the llvm cmake build system).

The commit message (formatted nicely for git I admit) would be:

<COMMIT_MSG>
Make an llvm-config for cross-compilation

The llvm-config-host program that was installed wasn't
host-related at all; it runs on build and also reports
about build. This program is still needed for the build
to work, so a new BuildToolsCross folder is created and
in there, an llvm-config is built that runs on build
and reports about host.

For this to work, the Makefile that generates llvm-config
and the one that generates BuildVariables.inc must not be
the same, so Makefile.buildvars is used, and an extra var
CROSS_DEPTH is used to enable BuildToolsCross to step one
folder higher up into the top-level build folder to get
the correct values to be emitted into BuildVariables.inc.

The old BuildTools/*/bin/llvm-config is now installed
as llvm-config-build, and the new one is installed as
llvm-config-host
</COMMIT_MSG>

Many thanks,

Ray Donnelly.
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