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i#5411 bbdup mem: Shrink per-thread heap usage

Merged Derek Bruening requested to merge i5411-bbdup-thread-heap into master

Moves all drbbdup per-thread memory to unreachable heap.

Moves the drbbdup dynamic case hit table to be dynamically allocated based on a new drbbdup option "never_enable_dynamic_handling" not being set. This eliminates 128K per thread for drmemtrace, which makes a big difference on large applications.

Sanity test: Before:

  $ bin64/drrun -rstats_to_stderr -t drcachesim -offline -max_global_trace_refs 10K -- suite/tests/bin/client.annotation-concurrency libclient.annotation-concurrency.appdll.so A 4 64 3
              Peak threads under DynamoRIO control :                 5
              Peak vmm blocks for unreachable heap :               767
                Peak vmm blocks for reachable heap :               726
            Peak vmm virtual memory in use (bytes) :          10293248

After:

              Peak threads under DynamoRIO control :                 5
              Peak vmm blocks for unreachable heap :               736
                Peak vmm blocks for reachable heap :               250
            Peak vmm virtual memory in use (bytes) :           8183808

Issue: #5411 (closed)