[rocr] Remove loader-side gfx125x entry trampolines

[harsh-amd]

Stack

Layer 3 of the rocm-systems hotswap stack, paired with the COMGR hotswap stack after COMGR owns the rewrite machinery.

• Layer 1: [hotswap] Install and link libhsa-hotswap tool #7577
• Layer 2: fix(hotswap): gate entry trampoline rewrites for gfx12.5 #7593
• This layer: remove ROCr loader-side gfx125x trampoline code from Install Kernel Trampolines #7581 while preserving the gfx125x blit-kernel changes
• Layer-only diff: harsh-amd/rocm-systems@hotswap-entry-trampoline-gating...hotswap-rocr-loader-trampoline-removal

GitHub targets this PR at develop, so the default Files view includes prior stack layers. Use the layer-only diff above for review of this layer.

Summary

• Remove the ROCr loader-owned gfx125x kernel-entry trampoline allocation, stub emission, descriptor fixups, and trampoline segment freezing added by Install Kernel Trampolines #7581.
• Preserve the Install Kernel Trampolines #7581 gfx125x blit-kernel v_nop changes; this layer has no blit_shaders diff.
• Drop the loader-owned kernel descriptor fixup state and helper declarations from ExecutableImpl.
• Leave runtime request gating in libhsa-hotswap.so and binary rewriting in COMGR.

Paired PRs

• COMGR stack: [AMDGPU][COMGR] Remove COMGR hotswap HSA tool llvm-project#3007, AMDGPU: add hotswap entry trampoline core llvm-project#3008, [AMDGPU][COMGR] Add hotswap text displacement infrastructure llvm-project#3000
• TheRock integration: feat(hotswap): integrate entry trampoline subprojects TheRock#6018

Testing

• git diff --check hotswap-entry-trampoline-gating...HEAD
• rg -n "InstallTrampolines|trampoline_enabled|kd_fixups|trampoline_segments|BuildTrampoline|CodeObjectIsaIsGfx125|kTrampoline|kInstPrefUnitBytes" projects/rocr-runtime/runtime/hsa-runtime/loader/executable.cpp projects/rocr-runtime/runtime/hsa-runtime/loader/executable.hpp (no matches)
• git diff --name-only hotswap-entry-trampoline-gating...HEAD -- projects/rocr-runtime/runtime/hsa-runtime/core/runtime/blit_shaders (no output)

[therock-pr-bot]

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