Refactor huge allocation to be managed by arenas.

Refactor huge allocation to be managed by arenas (though the global
red-black tree of huge allocations remains for lookup during
deallocation).  This is the logical conclusion of recent changes that 1)
made per arena dss precedence apply to huge allocation, and 2) made it
possible to replace the per arena chunk allocation/deallocation
functions.

Remove the top level huge stats, and replace them with per arena huge
stats.

Normalize function names and types to *dalloc* (some were *dealloc*).

Remove the --enable-mremap option.  As jemalloc currently operates, this
is a performace regression for some applications, but planned work to
logarithmically space huge size classes should provide similar amortized
performance.  The motivation for this change was that mremap-based huge
reallocation forced leaky abstractions that prevented refactoring.

configure.ac

@@ -793,33 +793,6 @@ if test "x$enable_tcache" = "x1" ; then
 fi
 AC_SUBST([enable_tcache])
 
-dnl Disable mremap() for huge realloc() by default.
-AC_ARG_ENABLE([mremap],
-  [AS_HELP_STRING([--enable-mremap], [Enable mremap(2) for huge realloc()])],
-[if test "x$enable_mremap" = "xno" ; then
-  enable_mremap="0"
-else
-  enable_mremap="1"
-fi
-],
-[enable_mremap="0"]
-)
-if test "x$enable_mremap" = "x1" ; then
-  JE_COMPILABLE([mremap(...MREMAP_FIXED...)], [
-#define	_GNU_SOURCE
-#include <sys/mman.h>
-], [
-void *p = mremap((void *)0, 0, 0, MREMAP_MAYMOVE|MREMAP_FIXED, (void *)0);
-], [je_cv_mremap_fixed])
-  if test "x${je_cv_mremap_fixed}" = "xno" ; then
-    enable_mremap="0"
-  fi
-fi
-if test "x$enable_mremap" = "x1" ; then
-  AC_DEFINE([JEMALLOC_MREMAP], [ ])
-fi
-AC_SUBST([enable_mremap])
-
 dnl Enable VM deallocation via munmap() by default.
 AC_ARG_ENABLE([munmap],
   [AS_HELP_STRING([--disable-munmap], [Disable VM deallocation via munmap(2)])],
@@ -1447,7 +1420,6 @@ AC_MSG_RESULT([fill               : ${enable_fill}])
 AC_MSG_RESULT([utrace             : ${enable_utrace}])
 AC_MSG_RESULT([valgrind           : ${enable_valgrind}])
 AC_MSG_RESULT([xmalloc            : ${enable_xmalloc}])
-AC_MSG_RESULT([mremap             : ${enable_mremap}])
 AC_MSG_RESULT([munmap             : ${enable_munmap}])
 AC_MSG_RESULT([lazy_lock          : ${enable_lazy_lock}])
 AC_MSG_RESULT([tls                : ${enable_tls}])