[SDPatternMatch] Support conditionally binding the value matching a sub-pattern (#182091) I've seen more and more occurrences of what is essentially ``` m_AllOf(<sub pattern>, m_Value(BindVal)) ``` That is, bind to the same SDValue that matches the sub-pattern. Most people won't even bother write this `m_AllOf` construct because it's too long, and instead just write another `sd_match` against the bound value. This patch adds ``` m_Value(BindVal, <sub pattern>) ``` To replace the `m_AllOf` construct above and conditionally bind the SDValue that matches the sub-pattern. --------- Co-authored-by: Stefan Weigl-Bosker <stefan@s00.xyz>
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