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release notes: add two optimizer items
Report by Tom Lane
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doc/src/sgml/release-9.5.sgml

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</para>
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</listitem>
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<listitem>
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<para>
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Allow the optimizer to remove unnecessary references to left
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outer join subqueries (David Rowley)
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</para>
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</listitem>
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<listitem>
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<para>
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Allow pushdown of query restrictions into <link
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linkend="functions-window">window functions</>, where appropriate
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(David Rowley)
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</para>
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</listitem>
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<listitem>
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<para>
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Speed up <acronym>CRC</> (cyclic redundancy check) computations

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