[turbofan] extend escape analysis to reduce CheckMaps
R=bmeurer@chromium.org BUG= Review-Url: https://codereview.chromium.org/2680973013 Cr-Original-Commit-Position: refs/heads/master@{#43163} Committed: https://chromium.googlesource.com/v8/v8/+/f01c8a6e4b24ab38e58bb141fc251bc6b75dbe21 Review-Url: https://codereview.chromium.org/2680973013 Cr-Commit-Position: refs/heads/master@{#43478}
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