Remove extra definition of je_tsd_boot on win32.
teach the dss chunk allocator to handle new_addr

This provides in-place expansion of huge allocations when the end of the
allocation is at the end of the sbrk heap. There's already the ability
to extend in-place via recycled chunks but this handles the initial
growth of the heap via repeated vector / string reallocations.

A possible future extension could allow realloc to go from the following:

    | huge allocation | recycled chunks |
                                        ^ dss_end

To a larger allocation built from recycled *and* new chunks:

    |                      huge allocation                      |
                                                                ^ dss_end

Doing that would involve teaching the chunk recycling code to request
new chunks to satisfy the request. The chunk_dss code wouldn't require
any further changes.

    #include <stdlib.h>

    int main(void) {
        size_t chunk = 4 * 1024 * 1024;
        void *ptr = NULL;
        for (size_t size = chunk; size < chunk * 128; size *= 2) {
            ptr = realloc(ptr, size);
            if (!ptr) return 1;
        }
    }

dss:secondary: 0.083s
dss:primary: 0.083s

After:

dss:secondary: 0.083s
dss:primary: 0.003s

The dss heap grows in the upwards direction, so the oldest chunks are at
the low addresses and they are used first. Linux prefers to grow the
mmap heap downwards, so the trick will not work in the *current* mmap
chunk allocator as a huge allocation will only be at the top of the heap
in a contrived case.
Fix test_stats_arenas_bins for 32-bit builds.
Fix OOM cleanup in huge_palloc().

Fix OOM cleanup in huge_palloc() to call idalloct() rather than
base_node_dalloc().  This bug is a result of incomplete refactoring, and
has no impact other than leaking memory during OOM.
Implement stats.bookkeeping.

This accounts for:
    - All base allocations, including arena headers;
    - All chunk headers;
    - Extent nodes used for huge allocations;
    - All allocations performed via a0{m,c}alloc.

This leaves missing:
    - Allocations made for tcache;
    - Allocations made for the quarantine;
    - Allocations made for heap profiling.
Account for tcache bookkeeping.