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add support for alignment attributes on load/store instructions

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and simplifies expressions. This implements the optimization described
in PR807.

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1. Check for Perl and only build llvm-config if its available.
2. Add some virtual components
3. Don't depend on "standard" location for Perl, but configured location
4. Document the tool with a POD file.

This version is now ready for testing by users.

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file.

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