8362279: [vectorapi] VECTOR_OP_SUADD needs reduction support

[igraves]

Adding SUADD to reduction support in the Vector API as it is now treated as an associative operator.

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Issue

• JDK-8362279: [vectorapi] VECTOR_OP_SUADD needs reduction support (Bug - P4)

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[igraves]

@merykitty If you could review, thanks!

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