DataFlowSanitizer: Prefix the name of each instrumented function with "dfs$".

DFSan changes the ABI of each function in the module.  This makes it possible
for a function with the native ABI to be called with the instrumented ABI,
or vice versa, thus possibly invoking undefined behavior.  A simple way
of statically detecting instances of this problem is to prepend the prefix
"dfs$" to the name of each instrumented-ABI function.

This will not catch every such problem; in particular function pointers passed
across the instrumented-native barrier cannot be used on the other side.
These problems could potentially be caught dynamically.

Differential Revision: http://llvm-reviews.chandlerc.com/D1373
DataFlowSanitizer: Factor the wrapper builder out to buildWrapperFunction.

Differential Revision: http://llvm-reviews.chandlerc.com/D1441
DataFlowSanitizer: Replace non-instrumented aliases of instrumented functions, and vice versa, with wrappers.

Differential Revision: http://llvm-reviews.chandlerc.com/D1442
DataFlowSanitizer: Add a design doc paragraph on checking ABI consistency.

Differential Revision: http://llvm-reviews.chandlerc.com/D1443