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Without an explicit deduction guide compilation fails with ``` error: 'SimpleAllocator' may not intend to support class template argument deduction [-Werror,-Wctad-maybe-unsupported] 53 | SimpleAllocator cpu_allocator(DartCallingConvention::kCpuRegistersForArgs); ``` TEST=verified by manual build with a flag R=aam@google.com Change-Id: I858863f7febb44ab81635e2c8466f84055c6e8b2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/357144 Auto-Submit: Slava Egorov <vegorov@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Commit-Queue: Slava Egorov <vegorov@google.com>