Add a separate scope for switch
The ES2015 specification for switch statements 13.12.11 specifies that they get their own lexical scope. This patch introduces such a scope through a complex desugaring in terms of blocks, done so that Crankshaft does not have to be updated to support multiple constructs providing scopes. Recommitting this patch after a bug fix in Crankshaft to allow a desugaring with certain elements missing a source location: https://codereview.chromium.org/1313443002 BUG=v8:4377 LOG=Y R=adamk Review URL: https://codereview.chromium.org/1309163003 Cr-Commit-Position: refs/heads/master@{#30340}
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