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Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

typeid-ref.cpp
// RUN: %clang_cc1 -triple %itanium_abi_triple -emit-llvm -o - %s | FileCheck %s
namespace std {
  class type_info;
}

struct X { };

void f() {
  // CHECK: @_ZTS1X = linkonce_odr {{(dso_local |hidden )?}}constant
  // CHECK: @_ZTI1X = linkonce_odr {{(dso_local |hidden )?}}constant
  (void)typeid(X&);
}