Revert MR383 and fix

Merged Yang Wang requested to merge wangyang.cs/ECM:revertMR380andfix into master

Revert MR!383 and new fix for IBC-GPM when EnableTMTools=0. Compared to ECM master (b0b60510), the reported performance changes are as follows: Class F/TGM: AI: -0.04%/0.13%/0.34%, 0.00%/0.02%/-0.01%; RA: 0.00%/-0.06%/-0.33%, -0.04%/-0.10%/-0.12%; LDB: For SlideShow, -0.06%/-0.79%/-1.96%; Remains are under testing.

Edited by Vadim Seregin

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