Fix lint error in 3.1 branch.
Review URL: http://codereview.chromium.org/7067016

git-svn-id: http://v8.googlecode.com/svn/branches/3.1@8010 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 4f27371..1bce34b 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -791,7 +791,7 @@
 
 class HDeoptimize: public HControlInstruction {
  public:
-  HDeoptimize(int environment_length)
+  explicit HDeoptimize(int environment_length)
       : HControlInstruction(NULL, NULL),
         values_(environment_length) { }
 
diff --git a/src/version.cc b/src/version.cc
index c7e1bc5..3682021 100644
--- a/src/version.cc
+++ b/src/version.cc
@@ -35,7 +35,7 @@
 #define MAJOR_VERSION     3
 #define MINOR_VERSION     1
 #define BUILD_NUMBER      8
-#define PATCH_LEVEL       19
+#define PATCH_LEVEL       20
 #define CANDIDATE_VERSION false
 
 // Define SONAME to have the SCons build the put a specific SONAME into the