Help test out ThinLTO!

compiler
2

I tried this on Serde’s json benchmarks. Compile time was about twice as fast, and runtime ranged from 12% faster to 16% slower. Nicely done!

Before

                                DOM                STRUCT
======= serde_json ======= parse|stringify === parse|stringify ===
data/canada.json          11.0ms    11.4ms     4.3ms     7.0ms
data/citm_catalog.json     5.5ms     1.4ms     2.1ms     0.7ms
data/twitter.json          2.5ms     0.6ms     1.2ms     0.6ms

After

                                DOM                STRUCT
======= serde_json ======= parse|stringify === parse|stringify ===
data/canada.json           9.7ms    11.0ms     4.0ms     7.7ms
data/citm_catalog.json     6.0ms     1.4ms     2.0ms     0.8ms
data/twitter.json          2.9ms     0.7ms     1.2ms     0.6ms
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