[AIX][TOC] Fix buildbot failures from commit b4ae8df (llvm#85303)

The following tests fail when built with Address
and Undefined sanitizers:
CodeGen/PowerPC/basic-toc-data-def.ll
CodeGen/PowerPC/toc-data-large-array2.ll

Subtarget may be null in emitGlobalVariable, for example in the testcase
where we have no functions in the IR. The fix moves this function from
PPCSubtarget to a static helper function. This only fails with
sanitizers because the Subtarget is not used in the member function.

Author: syzaara

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -2651,6 +2651,27 @@ uint64_t PPCAIXAsmPrinter::getAliasOffset(const Constant *C) {
   return 0;
 }
 
+static void tocDataChecks(unsigned PointerSize, const GlobalVariable *GV) {
+  // TODO: These asserts should be updated as more support for the toc data
+  // transformation is added (struct support, etc.).
+  assert(
+      PointerSize >= GV->getAlign().valueOrOne().value() &&
+      "GlobalVariables with an alignment requirement stricter than TOC entry "
+      "size not supported by the toc data transformation.");
+
+  Type *GVType = GV->getValueType();
+  assert(GVType->isSized() && "A GlobalVariable's size must be known to be "
+                              "supported by the toc data transformation.");
+  if (GV->getParent()->getDataLayout().getTypeSizeInBits(GVType) >
+      PointerSize * 8)
+    report_fatal_error(
+        "A GlobalVariable with size larger than a TOC entry is not currently "
+        "supported by the toc data transformation.");
+  if (GV->hasPrivateLinkage())
+    report_fatal_error("A GlobalVariable with private linkage is not "
+                       "currently supported by the toc data transformation.");
+}
+
 void PPCAIXAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
   // Special LLVM global arrays have been handled at the initialization.
   if (isSpecialLLVMGlobalArrayToSkip(GV) || isSpecialLLVMGlobalArrayForStaticInit(GV))
@@ -2660,7 +2681,7 @@ void PPCAIXAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
   // when we emit the .toc section.
   if (GV->hasAttribute("toc-data")) {
     unsigned PointerSize = GV->getParent()->getDataLayout().getPointerSize();
-    Subtarget->tocDataChecks(PointerSize, GV);
+    tocDataChecks(PointerSize, GV);
     TOCDataGlobalVars.push_back(GV);
     return;
   }

llvm/lib/Target/PowerPC/PPCSubtarget.cpp

@@ -185,28 +185,6 @@ bool PPCSubtarget::enableSubRegLiveness() const {
   return UseSubRegLiveness;
 }
 
-void PPCSubtarget::tocDataChecks(unsigned PointerSize,
-                                 const GlobalVariable *GV) const {
-  // TODO: These asserts should be updated as more support for the toc data
-  // transformation is added (struct support, etc.).
-  assert(
-      PointerSize >= GV->getAlign().valueOrOne().value() &&
-      "GlobalVariables with an alignment requirement stricter than TOC entry "
-      "size not supported by the toc data transformation.");
-
-  Type *GVType = GV->getValueType();
-  assert(GVType->isSized() && "A GlobalVariable's size must be known to be "
-                              "supported by the toc data transformation.");
-  if (GV->getParent()->getDataLayout().getTypeSizeInBits(GVType) >
-      PointerSize * 8)
-    report_fatal_error(
-        "A GlobalVariable with size larger than a TOC entry is not currently "
-        "supported by the toc data transformation.");
-  if (GV->hasPrivateLinkage())
-    report_fatal_error("A GlobalVariable with private linkage is not "
-                       "currently supported by the toc data transformation.");
-}
-
 bool PPCSubtarget::isGVIndirectSymbol(const GlobalValue *GV) const {
   // Large code model always uses the TOC even for local symbols.
   if (TM.getCodeModel() == CodeModel::Large)

llvm/lib/Target/PowerPC/PPCSubtarget.h

@@ -245,8 +245,6 @@ class PPCSubtarget : public PPCGenSubtargetInfo {
   /// True if the GV will be accessed via an indirect symbol.
   bool isGVIndirectSymbol(const GlobalValue *GV) const;
 
-  void tocDataChecks(unsigned PointerSize, const GlobalVariable *GV) const;
-
   /// True if the ABI is descriptor based.
   bool usesFunctionDescriptors() const {
     // Both 32-bit and 64-bit AIX are descriptor based. For ELF only the 64-bit