Initialize flag before usage.

This fixes a crash when running with --concurrent-osr.

R=ulan@chromium.org, dslomov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/25279002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17031 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.h

@@ -513,7 +513,8 @@ class RecompileJob: public ZoneObject {
         graph_builder_(NULL),
         graph_(NULL),
         chunk_(NULL),
-        last_status_(FAILED) { }
+        last_status_(FAILED),
+        awaiting_install_(false) { }
 
   enum Status {
     FAILED, BAILED_OUT, SUCCEEDED