Don't ignore return value of CommitCodePage in AllocateAlignedMemory.

src/spaces.h

Index: src/spaces.h
diff --git a/src/spaces.h b/src/spaces.h
index de9f0b596668b6271ac982e1bb72c6e57f5a9f96..b0ecc5d0040278c19cf9778d6c9524506880e33c 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -1042,7 +1042,9 @@ class MemoryAllocator {
     return CodePageAreaEndOffset() - CodePageAreaStartOffset();
   }
 
-  static bool CommitCodePage(VirtualMemory* vm, Address start, size_t size);
+  MUST_USE_RESULT static bool CommitCodePage(VirtualMemory* vm,
+                                             Address start,
+                                             size_t size);
 
  private:
   Isolate* isolate_;