Remove some asserts to speed up debug mode.

src/mark-compact-inl.h

Index: src/mark-compact-inl.h
===================================================================
--- src/mark-compact-inl.h	(revision 9581)
+++ src/mark-compact-inl.h	(working copy)
@@ -38,7 +38,7 @@
 
 
 MarkBit Marking::MarkBitFrom(Address addr) {
-  MemoryChunk *p = MemoryChunk::FromAddress(addr);
+  MemoryChunk* p = MemoryChunk::FromAddress(addr);
   return p->markbits()->MarkBitFromIndex(p->AddressToMarkbitIndex(addr),
                                          p->ContainsOnlyData());
 }