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Delete main? This cannot be undone.

hash_builtin.cpp
// RUN: %clang_cc1 -triple amdgcn -target-cpu gfx906 -E %s -o - | FileCheck %s

// CHECK: has_s_memtime_inst
#if __has_builtin(__builtin_amdgcn_s_memtime)
  int has_s_memtime_inst;
#endif

// CHECK-NOT: has_gfx10_inst
#if __has_builtin(__builtin_amdgcn_mov_dpp8)
  int has_gfx10_inst;
#endif