[llvm] [X86][GlobalISel] Support globals in pic mode (PR #170038)

[Matt Arsenault via llvm-commits]

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@@ -41,6 +41,14 @@ def G_FLDCW16 : X86GenericInstruction {
   let mayLoad = true;
 }
 
+// RIP-relative address wrapper for PIC mode global access.
+// Equivalent to X86ISD::WrapperRIP in SelectionDAG.
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arsenm wrote:

I'd still probably leave it in 

https://github.com/llvm/llvm-project/pull/170038