[clang] [os_log] Fix a CodeGen crash that occurs when arguments of struct, class, or complex types are passed to _builtin_os_log_format (PR #158744)

[via cfe-commits]

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@@ -70,22 +70,31 @@ class OSLogFormatStringHandler
   bool HandlePrintfSpecifier(const analyze_printf::PrintfSpecifier &FS,
                              const char *StartSpecifier, unsigned SpecifierLen,
                              const TargetInfo &) override {
+    // Set the argument expression. Arguments of struct/class/complex types are
+    // ignored.
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apple-fcloutier wrote:

Is there any reason we can't diagnose this as an error? A priori, it seems no 
one can be doing this right now because it crashes clang. The layout is going 
to be super broken if we skip arguments.

https://github.com/llvm/llvm-project/pull/158744
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