[Clang][ARM] Call constructor on BranchTargetInfo. (#98307)

Otherwise members will be uninitialised.

Author: DanielKristofKiss

clang/include/clang/Basic/TargetInfo.h

@@ -1434,7 +1434,12 @@ class TargetInfo : public TransferrableTargetInfo,
     }
 
   public:
-    BranchProtectionInfo() = default;
+    BranchProtectionInfo()
+        : SignReturnAddr(LangOptions::SignReturnAddressScopeKind::None),
+          SignKey(LangOptions::SignReturnAddressKeyKind::AKey),
+          BranchTargetEnforcement(false), BranchProtectionPAuthLR(false),
+          GuardedControlStack(false) {}
+
     BranchProtectionInfo(const LangOptions &LangOpts) {
       SignReturnAddr =
           LangOpts.hasSignReturnAddress()

clang/lib/CodeGen/Targets/ARM.cpp

@@ -141,7 +141,7 @@ class ARMTargetCodeGenInfo : public TargetCodeGenInfo {
       ParsedTargetAttr Attr =
           CGM.getTarget().parseTargetAttr(TA->getFeaturesStr());
       if (!Attr.BranchProtection.empty()) {
-        TargetInfo::BranchProtectionInfo BPI;
+        TargetInfo::BranchProtectionInfo BPI{};
         StringRef DiagMsg;
         StringRef Arch =
             Attr.CPU.empty() ? CGM.getTarget().getTargetOpts().CPU : Attr.CPU;

clang/lib/Sema/SemaDeclAttr.cpp

@@ -2991,7 +2991,7 @@ bool Sema::checkTargetAttr(SourceLocation LiteralLoc, StringRef AttrStr) {
              << Unsupported << None << CurFeature << Target;
   }
 
-  TargetInfo::BranchProtectionInfo BPI;
+  TargetInfo::BranchProtectionInfo BPI{};
   StringRef DiagMsg;
   if (ParsedAttrs.BranchProtection.empty())
     return false;