[llvm] [AMDGPU] Replace `isInlinableLiteral16` with specific version (PR #81345)

[Stanislav Mekhanoshin via llvm-commits]

================
@@ -462,8 +462,8 @@ void AMDGPUInstPrinter::printImmediateInt16(uint32_t Imm,
 
 // This must accept a 32-bit immediate value to correctly handle packed 16-bit
----------------
rampitec wrote:

It seems this comment is long obsolete.

https://github.com/llvm/llvm-project/pull/81345