[llvm] [AMDGPU] Fix .Lfunc_end label placement (PR #127549)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

> EmitFunctionSize

`EmitFunctionSize` is a local bool variable inside `AsmPrinter::emitFunctionBody()` and it is set to true. This is how this label is emitted.

https://github.com/llvm/llvm-project/pull/127549