Sanity check IMemory access versus underlying mmap

Bug 26877992

Change-Id: Ibbf4b1061e4675e4e96bc944a865b53eaf6984fe

int BpMemoryHeap::getHeapID() const {
    assertMapped();
 return mHeapId;
}

int BpMemoryHeap::getHeapID() const {
    assertMapped();
 return mHeapId;
}
