[clang] [llvm] [AMDGPU] Emit a waitcnt instruction after each memory instruction (PR #79236)

[Pierre van Houtryve via cfe-commits]

================
@@ -355,6 +356,18 @@ class SICacheControl {
                                    MachineBasicBlock::iterator &MI) const {
     return false;
   }
+
+public:
+  // The following is for supporting precise memory mode. When the option
+  // amdgpu-precise-memory is enabled, an s_waitcnt instruction is inserted
+  // after each memory instruction.
+
+  virtual bool
+  handleNonAtomicForPreciseMemory(MachineBasicBlock::iterator &MI) = 0;
+  /// Handles atomic instruction \p MI with \p IsAtomicWithRet indicating
+  /// whether \p MI returns a result.
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Pierre-vh wrote:

IMO the comment isn't needed, I think the function's name describes it well enough (and the comment just before adds enough context), the comment just rephrases the function + argument names

https://github.com/llvm/llvm-project/pull/79236