5255 uts shouldn't open-code ISP2

@@ -918,11 +918,11 @@
 {
         int hb;
         int flist = 0;
         ASSERT(MUTEX_HELD(&vmp->vm_lock));
 
-        if ((size & (size - 1)) == 0)
+        if (ISP2(size))
                 flist = lowbit(P2ALIGN(vmp->vm_freemap, size));
         else if ((hb = highbit(size)) < VMEM_FREELISTS)
                 flist = lowbit(P2ALIGN(vmp->vm_freemap, 1UL << hb));
 
         return (flist);

@@ -957,12 +957,11 @@
                 panic("vmem_xalloc(%p, %lu, %lu, %lu, %lu, %p, %p, %x): "
                     "overconstrained allocation",
                     (void *)vmp, size, align_arg, phase, nocross,
                     minaddr, maxaddr, vmflag);
 
-        if (phase >= align || (align & (align - 1)) != 0 ||
-            (nocross & (nocross - 1)) != 0)
+        if (phase >= align || !ISP2(align) || !ISP2(nocross))
                 panic("vmem_xalloc(%p, %lu, %lu, %lu, %lu, %p, %p, %x): "
                     "parameters inconsistent or invalid",
                     (void *)vmp, size, align_arg, phase, nocross,
                     minaddr, maxaddr, vmflag);
 

@@ -992,11 +991,11 @@
                  * (3)  We're in the highest possible freelist, which is
                  *      always empty (e.g. the 4GB freelist on 32-bit systems);
                  *
                  * (4)  We're doing a best-fit or first-fit allocation.
                  */
-                if ((size & (size - 1)) == 0) {
+                if (ISP2(size)) {
                         flist = lowbit(P2ALIGN(vmp->vm_freemap, size));
                 } else {
                         hb = highbit(size);
                         if ((vmp->vm_freemap >> hb) == 0 ||
                             hb == VMEM_FREELISTS ||

@@ -1288,11 +1287,11 @@
          * Unconstrained instant-fit allocation from the segment list.
          */
         mutex_enter(&vmp->vm_lock);
 
         if (vmp->vm_nsegfree >= VMEM_MINFREE || vmem_populate(vmp, vmflag)) {
-                if ((size & (size - 1)) == 0)
+                if (ISP2(size))
                         flist = lowbit(P2ALIGN(vmp->vm_freemap, size));
                 else if ((hb = highbit(size)) < VMEM_FREELISTS)
                         flist = lowbit(P2ALIGN(vmp->vm_freemap, 1UL << hb));
         }