Commits on Oct 18, 2017

1. Replace all uses of the heapsize crate with malloc_size_of. …

   Servo currently uses `heapsize`, but Stylo/Gecko use `malloc_size_of`.
   `malloc_size_of` is better -- it handles various cases that `heapsize` does not
   -- so this patch changes Servo to use `malloc_size_of`.
   
   This patch makes the following changes to the `malloc_size_of` crate.
   
   - Adds `MallocSizeOf` trait implementations for numerous types, some built-in
     (e.g. `VecDeque`), some external and Servo-only (e.g. `string_cache`).
   
   - Makes `enclosing_size_of_op` optional, because vanilla jemalloc doesn't
     support that operation.
   
   - For `HashSet`/`HashMap`, falls back to a computed estimate when
     `enclosing_size_of_op` isn't available.
   
   - Adds an extern "C" `malloc_size_of` function that does the actual heap
     measurement; this is based on the same functions from the `heapsize` crate.
   
   This patch makes the following changes elsewhere.
   
   - Converts all the uses of `heapsize` to instead use `malloc_size_of`.
   
   - Disables the "heapsize"/"heap_size" feature for the external crates that
     provide it.
   
   - Removes the `HeapSizeOf` implementation from `hashglobe`.
   
   - Adds `ignore` annotations to a few `Rc`/`Arc`, because `malloc_size_of`
     doesn't derive those types, unlike `heapsize`.

   

   nnethercote committed Oct 18, 2017
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