Bug 1669847 - Make CompilationStencil instantiation const. r=arai

Depends on D92831

Differential Revision: https://phabricator.services.mozilla.com/D92832

js/src/frontend/CompilationInfo.h

@@ -292,17 +292,17 @@ class ScriptStencilIterable {
 
   class Iterator {
     size_t index_ = 0;
-    CompilationStencil& stencil_;
+    const CompilationStencil& stencil_;
     CompilationGCOutput& gcOutput_;
 
-    Iterator(CompilationStencil& stencil, CompilationGCOutput& gcOutput,
+    Iterator(const CompilationStencil& stencil, CompilationGCOutput& gcOutput,
              size_t index)
         : index_(index), stencil_(stencil), gcOutput_(gcOutput) {
       skipNonFunctions();
     }
 
    public:
-    explicit Iterator(CompilationStencil& stencil,
+    explicit Iterator(const CompilationStencil& stencil,
                       CompilationGCOutput& gcOutput)
         : stencil_(stencil), gcOutput_(gcOutput) {
       skipNonFunctions();
@@ -342,16 +342,16 @@ class ScriptStencilIterable {
                                functionIndex);
     }
 
-    static Iterator end(CompilationStencil& stencil,
+    static Iterator end(const CompilationStencil& stencil,
                         CompilationGCOutput& gcOutput) {
       return Iterator(stencil, gcOutput, stencil.scriptData.length());
     }
   };
 
-  CompilationStencil& stencil_;
+  const CompilationStencil& stencil_;
   CompilationGCOutput& gcOutput_;
 
-  explicit ScriptStencilIterable(CompilationStencil& stencil,
+  explicit ScriptStencilIterable(const CompilationStencil& stencil,
                                  CompilationGCOutput& gcOutput)
       : stencil_(stencil), gcOutput_(gcOutput) {}