[COMMITTED] libitm: Fix recent changes to allocations log.

[Torvald Riegel]

This fixes an oversight in the recent changes to the allocations log for
supporting sized delete.

Tested libitm on x86_64-linux.  COmmitted as obvious.

        libitm/
        * libitm_i.h (gtm_alloc_action): Remove union.
        * testsuite/libitm.c/alloc-1.c: New.

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