ARM: Use ubfx and movw instructions to avoid a PC-relative load on

src/spaces.h

Index: src/spaces.h
===================================================================
--- src/spaces.h	(revision 10578)
+++ src/spaces.h	(working copy)
@@ -720,6 +720,10 @@
   void ClearSweptPrecisely() { ClearFlag(WAS_SWEPT_PRECISELY); }
   void ClearSweptConservatively() { ClearFlag(WAS_SWEPT_CONSERVATIVELY); }
 
+  static Map* MapFromIntraPageOffset(int32_t offset);
+
+  Address RoundUpToObjectAlignment(Address a);
+
 #ifdef DEBUG
   void Print();
 #endif  // DEBUG
@@ -989,11 +993,13 @@
 
   Address ReserveAlignedMemory(size_t requested,
                                size_t alignment,
-                               VirtualMemory* controller);
+                               VirtualMemory* controller,
+                               intptr_t preferred_placement = 0);
   Address AllocateAlignedMemory(size_t requested,
                                 size_t alignment,
                                 Executability executable,
-                                VirtualMemory* controller);
+                                VirtualMemory* controller,
+                                intptr_t preferred_placement = 0);
 
   void FreeMemory(VirtualMemory* reservation, Executability executable);
   void FreeMemory(Address addr, size_t size, Executability executable);