[llvm] [Reland][PatternMatch] Add `m_[Shift]OrSelf` matchers. (PR #154375)

[Yingwei Zheng via llvm-commits]

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@@ -627,17 +627,15 @@ struct LoadOps {
 // (ZExt(L1) << shift1) | ZExt(L2) -> ZExt(L3)
 static bool foldLoadsRecursive(Value *V, LoadOps &LOps, const DataLayout &DL,
                                AliasAnalysis &AA) {
-  const APInt *ShAmt2 = nullptr;
+  uint64_t ShAmt2;
   Value *X;
   Instruction *L1, *L2;
 
   // Go to the last node with loads.
-  if (match(V, m_OneUse(m_c_Or(
-                   m_Value(X),
-                   m_OneUse(m_Shl(m_OneUse(m_ZExt(m_OneUse(m_Instruction(L2)))),
-                                  m_APInt(ShAmt2)))))) ||
-      match(V, m_OneUse(m_Or(m_Value(X),
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dtcxzyw wrote:

It should be `m_c_Or`.

https://github.com/llvm/llvm-project/pull/154375