[clang] [clang][Sema] Accept gnu format attributes (PR #160255)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp,h -- clang/include/clang/Sema/Sema.h clang/lib/Sema/SemaChecking.cpp clang/lib/Sema/SemaDeclAttr.cpp clang/test/Sema/attr-format.c clang/test/Sema/format-strings-scanf.c clang/test/Sema/format-strings.c
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 614a7ba36..321fa4915 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -6863,7 +6863,8 @@ StringRef Sema::GetFormatStringTypeName(FormatStringType FST) {
 FormatStringType Sema::GetFormatStringType(StringRef Flavor) {
   return llvm::StringSwitch<FormatStringType>(Flavor)
       .Cases("gnu_scanf", "scanf", FormatStringType::Scanf)
-      .Cases("gnu_printf", "printf", "printf0", "syslog", FormatStringType::Printf)
+      .Cases("gnu_printf", "printf", "printf0", "syslog",
+             FormatStringType::Printf)
       .Cases("NSString", "CFString", FormatStringType::NSString)
       .Cases("gnu_strftime", "strftime", FormatStringType::Strftime)
       .Case("strfmon", FormatStringType::Strfmon)
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
index 1f19931b7..a00a10dd0 100644
--- a/clang/lib/Sema/SemaDeclAttr.cpp
+++ b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -3632,7 +3632,8 @@ static FormatAttrKind getFormatAttrKind(StringRef Format) {
       .Cases("gnu_strftime", "strftime", StrftimeFormat)
 
       // Otherwise, check for supported formats.
-      .Cases("gnu_scanf", "scanf", "gnu_printf", "printf", "printf0", "strfmon", SupportedFormat)
+      .Cases("gnu_scanf", "scanf", "gnu_printf", "printf", "printf0", "strfmon",
+             SupportedFormat)
       .Cases("cmn_err", "vcmn_err", "zcmn_err", SupportedFormat)
       .Cases("kprintf", "syslog", SupportedFormat) // OpenBSD.
       .Case("freebsd_kprintf", SupportedFormat)    // FreeBSD.

``````````

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https://github.com/llvm/llvm-project/pull/160255