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As discussed in the recent reduction speedup work:
https://github.com/openjdk/jdk/pull/13056 ~~JDK-8302652~~

duplicates

JDK-8323609 C2: Odd vectorization breakage with DBB.getLong loop

relates to

JDK-8188313 C2: Consider enabling auto-vectorization for simple reductions (disabled by JDK-8078563)

JDK-8340093 C2 SuperWord: implement cost model

JDK-8336000 C2 SuperWord: report that 2-element reductions do not vectorize

JDK-8302652 [SuperWord] Reduction should happen after loop, when possible

JDK-8357530 C2 SuperWord: Diagnostic flag AutoVectorizationOverrideProfitability

JDK-8318703 C2 SuperWord: take reduction nodes into account in early unrolling analysis

(2 relates to)