[clang] [clang][analyzer] Fix the false positive ArgInitializedness warning on unnamed bit-field (PR #145066)

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


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions c,cpp -- clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp clang/lib/StaticAnalyzer/Core/RegionStore.cpp clang/test/Analysis/call-and-message.c clang/test/Analysis/call-and-message.cpp
``````````

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<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
index 677cc6ee5..64587b205 100644
--- a/clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/CallAndMessageChecker.cpp
@@ -259,7 +259,7 @@ public:
         if (T->getAsStructureType()) {
           if (Find(FR))
             return true;
-        } else if (!I->isUnnamedBitField()){
+        } else if (!I->isUnnamedBitField()) {
           SVal V = StoreMgr.getBinding(store, loc::MemRegionVal(FR));
           if (V.isUndef())
             return true;
diff --git a/clang/lib/StaticAnalyzer/Core/RegionStore.cpp b/clang/lib/StaticAnalyzer/Core/RegionStore.cpp
index 120803670..2e509d09c 100644
--- a/clang/lib/StaticAnalyzer/Core/RegionStore.cpp
+++ b/clang/lib/StaticAnalyzer/Core/RegionStore.cpp
@@ -2133,7 +2133,7 @@ SVal RegionStoreManager::getBindingForField(RegionBindingsConstRef B,
   // The bits of the unnamed bit-field in local variable a can be anything.
   const FieldDecl *FD = R->getDecl();
   if (FD->isUnnamedBitField()) {
-      return UndefinedVal();
+    return UndefinedVal();
   }
 
   // If the containing record was initialized, try to get its constant value.

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https://github.com/llvm/llvm-project/pull/145066