Merge V8 at r7668: Initial merge by Git.

Change-Id: I1703c8b4f5c63052451a22cf3fb878abc9a0ec75
diff --git a/src/mips/virtual-frame-mips.h b/src/mips/virtual-frame-mips.h
index be8b74e..cf30b09 100644
--- a/src/mips/virtual-frame-mips.h
+++ b/src/mips/virtual-frame-mips.h
@@ -106,7 +106,7 @@
   inline VirtualFrame();
 
   // Construct an invalid virtual frame, used by JumpTargets.
-  inline VirtualFrame(InvalidVirtualFrameInitializer* dummy);
+  explicit inline VirtualFrame(InvalidVirtualFrameInitializer* dummy);
 
   // Construct a virtual frame as a clone of an existing one.
   explicit inline VirtualFrame(VirtualFrame* original);