Simplify small size class infrastructure.

Program-generate small size class tables for all valid combinations of
LG_TINY_MIN, LG_QUANTUM, and PAGE_SHIFT.  Use the appropriate table to generate
all relevant data structures, and remove the distinction between
tiny/quantum/cacheline/subpage bins.

Remove --enable-dynamic-page-shift.  This option didn't prove useful in
practice, and it prevented optimizations.

Add Tilera architecture support.

include/jemalloc/internal/mb.h

@@ -54,7 +54,7 @@ mb_write(void)
 	    );
 #endif
 }
-#elif (defined(__amd64_) || defined(__x86_64__))
+#elif (defined(__amd64__) || defined(__x86_64__))
 JEMALLOC_INLINE void
 mb_write(void)
 {
@@ -87,6 +87,13 @@ mb_write(void)
 	    : "memory" /* Clobbers. */
 	    );
 }
+#elif defined(__tile__)
+JEMALLOC_INLINE void
+mb_write(void)
+{
+
+	__sync_synchronize();
+}
 #else
 /*
  * This is much slower than a simple memory barrier, but the semantics of mutex