[PowerPC][NFC] Update aix-tls-xcoff-reloc.ll (#83764)

Update test case changed by #66316

Author: Felix (Ting Wang)

llvm/test/CodeGen/PowerPC/aix-tls-xcoff-reloc.ll

@@ -208,7 +208,7 @@ entry:
 ; SYM-NEXT:     StorageClass: C_EXT (0x2)
 ; SYM-NEXT:     NumberOfAuxEntries: 1
 ; SYM-NEXT:     CSECT Auxiliary Entry {
-; SYM-NEXT:       Index: 6
+; SYM-NEXT:       Index: [[#NFA+4]]
 ; SYM-NEXT:       SectionLen: 0
 ; SYM-NEXT:       ParameterHashIndex: 0x0
 ; SYM-NEXT:       TypeChkSectNum: 0x0