[llvm] [AIX] Support per global code model. (PR #79202)

[Amy Kwan via llvm-commits]

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@@ -186,9 +186,18 @@ bool PPCSubtarget::enableSubRegLiveness() const {
 }
 
 bool PPCSubtarget::isGVIndirectSymbol(const GlobalValue *GV) const {
+  if (isAIXABI() && isa<GlobalVariable>(GV)) {
+    // On AIX the only symbols that aren't indirect are toc-data.
+    if (cast<GlobalVariable>(GV)->hasAttribute("toc-data"))
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amy-kwan wrote:

nit: According to https://llvm.org/docs/ProgrammersManual.html#the-isa-cast-and-dyn-cast-templates, we should try not to use `isa<>` followed by `<cast>`?

https://github.com/llvm/llvm-project/pull/79202