Add the clang library to the repo (with some of my changes, too).

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diff --git a/clang/examples/clang-interpreter/README.txt b/clang/examples/clang-interpreter/README.txt
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+This is an example of Clang based interpreter, for executing standalone C
+programs.
+
+It demonstrates the following features:
+ 1. Parsing standard compiler command line arguments using the Driver library.
+
+ 2. Constructing a Clang compiler instance, using the appropriate arguments
+    derived in step #1.
+
+ 3. Invoking the Clang compiler to lex, parse, syntax check, and then generate
+    LLVM code.
+
+ 4. Use the LLVM JIT functionality to execute the final module.
+
+The implementation has many limitations and is not designed to be a full fledged
+C interpreter. It is designed to demonstrate a simple but functional use of the
+Clang compiler libraries.