Revert "Stop propagating/inlining string constants (#6234)" (#6258)

This reverts commit 9090ce56fcc67e15005aeedc59c6bc6773220f11.

This has the effect of once more propagating string constants from
globals to other places (and from non-globals too), which is useful
for various optimizations even if it isn't useful in the final output.
To fix the final output problem, #6257 added a pass that is run at the
end to collect string.const to globals, which allows us to once more
propagate strings in the optimizer, now without a downside.

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