[MCCAS] Fix uninitialzied variables in CASID file output

Fix uninitalized variables in IRGen options. Those options are
initialized with `|=` so it is important to initialize them to false.

Author: cachemeifyoucan

include/swift/AST/IRGenOptions.h

@@ -306,7 +306,7 @@ class IRGenOptions {
 
   /// Whether we're generating IR for the JIT.
   unsigned UseJIT : 1;
-  
+
   /// Whether we should run LLVM optimizations after IRGen.
   unsigned DisableLLVMOptzns : 1;
 
@@ -377,7 +377,7 @@ class IRGenOptions {
   /// Force public linkage for private symbols. Used only by the LLDB
   /// expression evaluator.
   unsigned ForcePublicLinkage : 1;
-  
+
   /// Force lazy initialization of class metadata
   /// Used on Windows to avoid cross-module references.
   unsigned LazyInitializeClassMetadata : 1;
@@ -439,7 +439,7 @@ class IRGenOptions {
   /// Whether to disable shadow copies for local variables on the stack. This is
   /// only used for testing.
   unsigned DisableDebuggerShadowCopies : 1;
-  
+
   /// Whether to disable using mangled names for accessing concrete type metadata.
   unsigned DisableConcreteTypeMetadataMangledNameAccessors : 1;
 
@@ -524,7 +524,7 @@ class IRGenOptions {
   };
 
   TypeInfoDumpFilter TypeInfoFilter;
-  
+
   /// Pull in runtime compatibility shim libraries by autolinking.
   std::optional<llvm::VersionTuple> AutolinkRuntimeCompatibilityLibraryVersion;
   std::optional<llvm::VersionTuple>
@@ -543,13 +543,13 @@ class IRGenOptions {
   llvm::CallingConv::ID PlatformCCallingConvention;
 
   /// Use CAS based object format as the output.
-  bool UseCASBackend;
+  bool UseCASBackend = false;
 
   /// The output mode for the CAS Backend.
   llvm::CASBackendMode CASObjMode;
 
   /// Emit a .casid file next to the object file if CAS Backend is used.
-  bool EmitCASIDFile;
+  bool EmitCASIDFile = false;
 
   /// Paths to the pass plugins registered via -load-pass-plugin.
   std::vector<std::string> LLVMPassPlugins;

include/swift/Frontend/FrontendOptions.h

@@ -137,9 +137,6 @@ class FrontendOptions {
   /// The module for which we should verify all of the generic signatures.
   std::string VerifyGenericSignaturesInModule;
 
-  /// Emit a .casid file next to the object file if CAS Backend is used.
-  bool EmitCASIDFile = false;
-
   /// CacheReplay PrefixMap.
   std::vector<std::string> CacheReplayPrefixMap;
 
@@ -389,7 +386,7 @@ class FrontendOptions {
   /// are errors. The resulting serialized AST may include errors types and
   /// skip nodes entirely, depending on the errors involved.
   bool AllowModuleWithCompilerErrors = false;
-  
+
   /// Whether or not the compiler must be strict in ensuring that implicit downstream
   /// module dependency build tasks must inherit the parent compiler invocation's context,
   /// such as `-Xcc` flags, etc.
@@ -519,7 +516,7 @@ class FrontendOptions {
 
   /// Whether we're configured to track system intermodule dependencies.
   bool shouldTrackSystemDependencies() const;
-  
+
   /// Whether we are configured with -typecheck or -typecheck-module-from-interface actuin
   bool isTypeCheckAction() const;
 
@@ -535,7 +532,7 @@ class FrontendOptions {
   ///
   /// \sa SymbolGraphASTWalker
   std::string SymbolGraphOutputDir;
-  
+
   /// Whether to emit doc comment information in symbol graphs for symbols
   /// which are inherited through classes or default implementations.
   bool SkipInheritedDocs = false;