[llvm] [clang] [AIX][TOC] Add -mtocdata/-mno-tocdata options on AIX (PR #67999)

[via cfe-commits]

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@@ -2520,7 +2520,9 @@ void PPCAIXAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
   // If the Global Variable has the toc-data attribute, it needs to be emitted
   // when we emit the .toc section.
   if (GV->hasAttribute("toc-data")) {
-    TOCDataGlobalVars.push_back(GV);
+    unsigned PointerSize = GV->getParent()->getDataLayout().getPointerSize();
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diggerlin wrote:

if we run 
`if (G.hasAttribute("toc-data"))
        (Subtarget->tocDataChecks(G.getParent()->getDataLayout().getPointerSize(), &G));`
 
 in the function `PPCAIXAsmPrinter::doInitialization(Module &M)`, 

 we do not need to do `tocDataChecks` in the function  `static bool hasTocDataAttr(SDValue Val, unsigned PointerSize, const PPCSubtarget *Subtarget) ` and here 
   
The function `hasTocDataAttr` is run for each PPCISD::TOC_ENTRY node, if a toc variable is referenced several time by the `PPCISD::TOC_ENTRY` in user application the function `tocDataChecks` will be called several times for the same variable and the `tocDataCheck` is not a small function. 

https://github.com/llvm/llvm-project/pull/67999