[NFC] [clang] make isFlexibleArrayMemberLike Ctx const (#126656)

it is not used mutably

Author: fmayer

clang/include/clang/AST/DeclBase.h

@@ -492,7 +492,7 @@ class alignas(8) Decl {
   /// perform non-Decl specific checks based on the object's type and strict
   /// flex array level.
   static bool isFlexibleArrayMemberLike(
-      ASTContext &Context, const Decl *D, QualType Ty,
+      const ASTContext &Context, const Decl *D, QualType Ty,
       LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
       bool IgnoreTemplateOrMacroSubstitution);
 

clang/include/clang/AST/Expr.h

@@ -542,7 +542,7 @@ class Expr : public ValueStmt {
   /// When IgnoreTemplateOrMacroSubstitution is set, it doesn't consider sizes
   /// resulting from the substitution of a macro or a template as special sizes.
   bool isFlexibleArrayMemberLike(
-      ASTContext &Context,
+      const ASTContext &Context,
       LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
       bool IgnoreTemplateOrMacroSubstitution = false) const;
 

clang/lib/AST/DeclBase.cpp

@@ -438,7 +438,7 @@ bool Decl::isFileContextDecl() const {
 }
 
 bool Decl::isFlexibleArrayMemberLike(
-    ASTContext &Ctx, const Decl *D, QualType Ty,
+    const ASTContext &Ctx, const Decl *D, QualType Ty,
     LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
     bool IgnoreTemplateOrMacroSubstitution) {
   // For compatibility with existing code, we treat arrays of length 0 or

clang/lib/AST/Expr.cpp

@@ -203,7 +203,7 @@ bool Expr::isKnownToHaveBooleanValue(bool Semantic) const {
 }
 
 bool Expr::isFlexibleArrayMemberLike(
-    ASTContext &Ctx,
+    const ASTContext &Ctx,
     LangOptions::StrictFlexArraysLevelKind StrictFlexArraysLevel,
     bool IgnoreTemplateOrMacroSubstitution) const {
   const Expr *E = IgnoreParens();