[clang] [Parser][ObjC] Add -Wobjc-prefix-length warning option. (PR #97597)

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git-clang-format --diff 48f55ba9d8e51cf976a8789521dd0763dea1e2d1 4980fcd7f274bba007c48aedb3b85c15c5796e3d --extensions cpp,h -- clang/include/clang/Basic/LangOptions.h clang/include/clang/Sema/SemaObjC.h clang/lib/Driver/ToolChains/Clang.cpp clang/lib/Parse/ParseObjc.cpp clang/lib/Sema/SemaDeclObjC.cpp clang/lib/Sema/SemaObjCProperty.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Sema/SemaDeclObjC.cpp b/clang/lib/Sema/SemaDeclObjC.cpp
index 60de53c968..fcbe98d96c 100644
--- a/clang/lib/Sema/SemaDeclObjC.cpp
+++ b/clang/lib/Sema/SemaDeclObjC.cpp
@@ -167,11 +167,10 @@ SemaObjC::ValidateObjCPublicName(StringRef Name) {
 static inline bool ObjCSelNameMatchesPrefix(StringRef Name, StringRef Prefix) {
   size_t NameLen = Name.size();
   size_t PrefixLen = Prefix.size();
-  return (NameLen >= PrefixLen &&
-          Name.starts_with_insensitive(Prefix) &&
-          (NameLen <= PrefixLen
-           || (isUppercase(Name[0]) && !isUppercase(Name[PrefixLen]))
-           || (isLowercase(Name[0]) && !isLowercase(Name[PrefixLen]))));
+  return (NameLen >= PrefixLen && Name.starts_with_insensitive(Prefix) &&
+          (NameLen <= PrefixLen ||
+           (isUppercase(Name[0]) && !isUppercase(Name[PrefixLen])) ||
+           (isLowercase(Name[0]) && !isLowercase(Name[PrefixLen]))));
 }
 
 SemaObjC::ObjCNameValidationResult

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https://github.com/llvm/llvm-project/pull/97597