[clang][bytecode] Fix allocating primitive arrays of unknown bound (#127788)

Author: tbaederr

clang/lib/AST/ByteCode/Compiler.cpp

@@ -3397,7 +3397,8 @@ bool Compiler<Emitter>::VisitCXXNewExpr(const CXXNewExpr *E) {
           CtorFunc = getFunction(CE->getConstructor());
           if (!CtorFunc)
             return false;
-        }
+        } else if (!DynamicInit)
+          DynamicInit = Init;
 
         LabelTy EndLabel = this->getLabel();
         LabelTy StartLabel = this->getLabel();

clang/test/AST/ByteCode/new-delete.cpp

@@ -907,6 +907,12 @@ namespace IncompleteArray {
     return c;
   }
   static_assert(test4() == 12);
+
+
+  constexpr char *f(int n) {
+    return new char[n]();
+  }
+  static_assert((delete[] f(2), true));
 }
 
 namespace NonConstexprArrayCtor {