[AMDGPU] Avoid using tuple where pair does suffice

Fixes the following building errors, happening with official Android prebuilt clang 14 shipped with Android 13:

external/llvm-project/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:5491:13: error: no viable constructor or deduction guide for deduction of template arguments of 'tuple'
          ? std::tuple(HSAMD::V3::AssemblerDirectiveBegin,
            ^
...
external/llvm-project/llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp:5493:13: error: no viable constructor or deduction guide for deduction of template arguments of 'tuple'
          : std::tuple(HSAMD::AssemblerDirectiveBegin,
            ^

Fixes: 6443c0ee ("[AMDGPU] Stop using make_pair and make_tuple. NFC.")

Patch by Mauro Rossi!

Differential Revision: https://reviews.llvm.org/D142839