[vm/compiler] Minor improvements in hashcodes and test for inefficient hashes This change improves a few implementations of hashcodes in compiler. Slightly improves AOT compilation time: gen_snapshot 60.736s -> 58.920s (-2.9%) (on a large Flutter app, compiled in release mode for arm64). Also, the same large app can be now compiled with --hash_map_probes_limit=1500, meaning that all hash maps in the compiler perform less than 1500 probes when looking for an element. This change also adds a test which verifies that kernel compiler itself can be compiled with --hash_map_probes_limit=1000. This is a sanity check to ensure we do not have a very badly distributed hashcode in the compiler. TEST=ci Issue: https://github.com/dart-lang/sdk/issues/43299 Change-Id: I7a802709727a33760c4f1d13f7b2c8cb263852d7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/229940 Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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