This fixes PR332 and ADCE/2004-05-04-UnreachableBlock.llx

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libraries and the C runtime support library

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Add a documentation comment for write_profiling_data().

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Edited comments.

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which case you'll get a null array and zero passed to the profiling function.

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acting like a normal pass.  :(

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check this in.

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Turning "if (A < B && B < C)" into "if (A < B & B < C)"

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  Turn "if (A < B && B < C)" into "if (A < B & B < C)"

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missing opportunities for combination.

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when replacing them, missing the opportunity to do simplifications

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Look at all of the pretty minuses. :)

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use MachineBasicBlocks.  To do this, we traverse the Machine CFG instead of
the LLVM CFG, which is also *MUCH* more efficient by having fewer levels of
indirections and mappings.

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use MachineBasicBlocks.

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functions with wrappers that either take or return size_ts.

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