[opt] Remove reference to new PM from description of optimization level flags (#65169)

Author: karka228

llvm/tools/opt/opt.cpp

@@ -149,32 +149,30 @@ static cl::opt<bool>
     StripNamedMetadata("strip-named-metadata",
                        cl::desc("Strip module-level named metadata"));
 
-
-
 static cl::opt<bool>
     OptLevelO0("O0", cl::desc("Optimization level 0. Similar to clang -O0. "
-                              "Use -passes='default<O0>' for the new PM"));
+                              "Same as -passes='default<O0>'"));
 
 static cl::opt<bool>
     OptLevelO1("O1", cl::desc("Optimization level 1. Similar to clang -O1. "
-                              "Use -passes='default<O1>' for the new PM"));
+                              "Same as -passes='default<O1>'"));
 
 static cl::opt<bool>
     OptLevelO2("O2", cl::desc("Optimization level 2. Similar to clang -O2. "
-                              "Use -passes='default<O2>' for the new PM"));
+                              "Same as -passes='default<O2>'"));
 
 static cl::opt<bool>
     OptLevelOs("Os", cl::desc("Like -O2 but size-conscious. Similar to clang "
-                              "-Os. Use -passes='default<Os>' for the new PM"));
+                              "-Os. Same as -passes='default<Os>'"));
 
 static cl::opt<bool> OptLevelOz(
     "Oz",
     cl::desc("Like -O2 but optimize for code size above all else. Similar to "
-             "clang -Oz. Use -passes='default<Oz>' for the new PM"));
+             "clang -Oz. Same as -passes='default<Oz>'"));
 
 static cl::opt<bool>
     OptLevelO3("O3", cl::desc("Optimization level 3. Similar to clang -O3. "
-                              "Use -passes='default<O3>' for the new PM"));
+                              "Same as -passes='default<O3>'"));
 
 static cl::opt<unsigned> CodeGenOptLevel(
     "codegen-opt-level",