[clang] [ABITest] Use _Alignof instead of __alignof__ for ABI alignment (PR #179031)

[Yanzuo Liu via cfe-commits]

================
@@ -306,7 +306,7 @@ def printSizeOfType(self, prefix, name, t, output=None, 
indent=2):
 
     def printAlignOfType(self, prefix, name, t, output=None, indent=2):
         print(
-            '%*sprintf("%s: __alignof__(%s) = %%ld\\n", 
(long)__alignof__(%s));'
+            '%*sprintf("%s: alignof(%s) = %%ld\\n", (long)_Alignof(%s));'
----------------
zwuis wrote:

Why use `alignof`, instead of `_Alignof`?

https://github.com/llvm/llvm-project/pull/179031
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