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Instead of naming string literals 'string literal', name ASCII-encodable
string literals using the first few characters of the literal (e.g.
"string contents" or "long string contents[...]").

Non-ASCII-encodable string literals are still called 'string literal',
and this change should be backwards-compatible.

Sample (filtered) output at
https://storage.googleapis.com/chrome-supersize/viewer.html?load_url=oneoffs%2Fsample-string-literals2.ndjson&byteunit=B&include=%22

This increased a sample .size filesize by 640K, about a 5% increase.

Bug: 939221
Change-Id: Iaf6a0200b1bf5ed9420f506377eb7b4d422d56cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815881
Commit-Queue: Jasper Chapman-Black <jaspercb@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699097}