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The stack slots of captured parameters must be skipped when generating sync code in optimized try-catch. Since those parameters are initially copied into the context, their values are not recorded in the environment. Store-to-load forwarding may though use the original initial value from the stack and therefore it must not be overwritten by try-sync code that predeeds every call inside optimized try-blocks. R=srdjan@google.com Review URL: https://codereview.chromium.org//653073002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@41099 260f80e4-7a28-3924-810f-c04153c831b5