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i#774 x64 reachability: extend reachability to out-of-line helper calls

Merged Derek Bruening requested to merge i774-out-of-line-reach into master

Applies DR_CLEANCALL_INDIRECT to out-of-line helper calls. Removes the hardcoded direct calls used for out-of-line clean call setup and cleanup code and replaces with insert_reachable_cti().

Fixes vmcode_unreachable_pc() to avoid a wraparound issue.

Adds a test where a client generates a clean call into custom non-code-cache memory.