[ItaniumDemangle] Add Named flag to "pm" operator (#136862)

Compilers can generate mangled names such as `_ZN1CpmEi` which we
currently fail to demangle. The OperatorInfo table only marked the `pt`
operator as being "named", which prevented the others from demangling
properly. Removing this logic for the other kinds of member operators
isn't causing any tests to fail.

Author: Michael137

libcxxabi/src/demangle/ItaniumDemangle.h

@@ -3421,7 +3421,7 @@ const typename AbstractManglingParser<
     {"or", OperatorInfo::Binary, false, Node::Prec::Ior, "operator|"},
     {"pL", OperatorInfo::Binary, false, Node::Prec::Assign, "operator+="},
     {"pl", OperatorInfo::Binary, false, Node::Prec::Additive, "operator+"},
-    {"pm", OperatorInfo::Member, /*Named*/ false, Node::Prec::PtrMem,
+    {"pm", OperatorInfo::Member, /*Named*/ true, Node::Prec::PtrMem,
      "operator->*"},
     {"pp", OperatorInfo::Postfix, false, Node::Prec::Postfix, "operator++"},
     {"ps", OperatorInfo::Prefix, false, Node::Prec::Unary, "operator+"},

libcxxabi/test/test_demangle.pass.cpp

@@ -30248,6 +30248,8 @@ const char* cases[][2] = {
 
     {"_Z3fooPU9__ptrauthILj3ELb1ELj234EEPi", "foo(int* __ptrauth<3u, true, 234u>*)"},
     {"_Z3fooIPU9__ptrauthILj1ELb0ELj64EEPiEvT_", "void foo<int* __ptrauth<1u, false, 64u>*>(int* __ptrauth<1u, false, 64u>*)"},
+
+    {"_ZN1CpmEi", "C::operator->*(int)"},
     // clang-format on
 };
 
@@ -30293,7 +30295,7 @@ const unsigned NF = sizeof(fp_literal_cases) / sizeof(fp_literal_cases[0]);
 const unsigned NEF = sizeof(fp_literal_cases[0].expecting) /
                      sizeof(fp_literal_cases[0].expecting[0]);
 
-const char *invalid_cases[] = {
+const char* invalid_cases[] = {
     // clang-format off
     "_ZIPPreEncode",
     "Agentt",
@@ -30351,6 +30353,8 @@ const char *invalid_cases[] = {
     "_ZGI3Foo",
     "_ZGIW3Foov",
     "W1x",
+    "_ZN1CdtEi",
+    "_ZN1CdsEi",
     // clang-format on
 };
 

llvm/include/llvm/Demangle/ItaniumDemangle.h

@@ -3421,7 +3421,7 @@ const typename AbstractManglingParser<
     {"or", OperatorInfo::Binary, false, Node::Prec::Ior, "operator|"},
     {"pL", OperatorInfo::Binary, false, Node::Prec::Assign, "operator+="},
     {"pl", OperatorInfo::Binary, false, Node::Prec::Additive, "operator+"},
-    {"pm", OperatorInfo::Member, /*Named*/ false, Node::Prec::PtrMem,
+    {"pm", OperatorInfo::Member, /*Named*/ true, Node::Prec::PtrMem,
      "operator->*"},
     {"pp", OperatorInfo::Postfix, false, Node::Prec::Postfix, "operator++"},
     {"ps", OperatorInfo::Prefix, false, Node::Prec::Unary, "operator+"},