[clang] [llvm] [SystemZ] Global Stackprotector and associated location section (PR #169317)

[Ulrich Weigand via cfe-commits]

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@@ -303,6 +307,10 @@ def z_pcrel_offset      : SDNode<"SystemZISD::PCREL_OFFSET",
 // to compare, and an integer of type SystemZICMP.
 def z_icmp              : SDNode<"SystemZISD::ICMP", SDT_ZICmp>;
 
+// A special form of icmp dedicated to comparing a stack protector value
+// to a stack slot. Kept separate to enable custom lowering.
+def z_csg              : SDNode<"SystemZISD::COMPARE_SG_DAG", SDT_ZCSG>;
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uweigand wrote:

Also, defining an operator pattern that is not used anywhere is odd.  I think you should use a matching pattern in the .td (as mentioned above).

https://github.com/llvm/llvm-project/pull/169317