Dragged in a bunch of alignment fixes from LL. Should allow disabling of tcmalloc on windows/linux32 if such is ever implemented.

indra/newview/llspatialpartition.cpp

@@ -412,6 +412,7 @@ void LLSpatialGroup::setVisible()
 
 void LLSpatialGroup::validate()
 {
+	ll_assert_aligned(this,64);
 #if LL_OCTREE_PARANOIA_CHECK
 
 	sg_assert(!isState(DIRTY));
@@ -1075,6 +1076,8 @@ LLSpatialGroup::LLSpatialGroup(OctreeNode* node, LLSpatialPartition* part) :
 	mLastUpdateDistance(-1.f), 
 	mLastUpdateTime(gFrameTimeSeconds)
 {
+	ll_assert_aligned(this,16);
+	
 	sNodeCount++;
 	LLMemType mt(LLMemType::MTYPE_SPACE_PARTITION);