[llvm] [DAG] SDPatternMatch - add m_Negative/m_StrictlyPositive/m_NonNegative/m_NonPositive/m_NonZero matchers (PR #175191)

[Simon Pilgrim via llvm-commits]

================
@@ -1213,6 +1244,21 @@ struct AllOnes_match {
   }
 };
 
+inline Negative_match m_Negative() {
----------------
RKSimon wrote:

Something like this should work (untested):
```
template <typename ValTy>
inline auto m_Negative(const ValTy &V) {
  return m_AllOf(m_Negative(), V);
}
```

https://github.com/llvm/llvm-project/pull/175191