[llvm] [AMDGPU] Add IR-level pass to rewrite away address space 7 (PR #77952)

[Piotr Sobczak via llvm-commits]

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@@ -1129,9 +1125,26 @@ void AMDGPUPassConfig::addCodeGenPrepare() {
     // but has been put before switch lowering and CFG flattening so that those
     // passes can run on the more optimized control flow this pass creates in
     // many cases.
+    //
+    // FIXME: This should ideally be put after the LoadStoreVectorizer.
+    // However, due to some annoying facts about ResourceUsageAnalysis,
+    // (especially as exercized in the resource-usage-dead-function test),
+    // we need all the function passes codegenprepare all the way through
+    // said resource usage analysis to run on the call graph produced
+    // before codegenprepare runs (because codegenprepare will knock some
+    // nodes out of the graph, which leads to funcction-level passes not
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piotrAMD wrote:

Typo funcction.

https://github.com/llvm/llvm-project/pull/77952