compare-commits.sh: support both llama-bench and test-backend-ops

[yeahdongcn]

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This is a follow-up to #14368, adding support for comparing test-backend-ops performance results between two commits.

Testing Done

Generated Tables

cd /Users/yexiaodong/go/src/github.com/ggerganov/llama.cpp && python3 scripts/compare-llama-bench.py -b 1d5f25c53 -c ecd7fdb4c --tool test-backend-ops -i ./test-backend-ops.sqlite
| Backend   | Operation   | Parameters                              |   Bandwidth (GB/s) 1d5f25c53 |   Bandwidth (GB/s) xd/compare |   Speedup |
|:----------|:------------|:----------------------------------------|-----------------------------:|------------------------------:|----------:|
| Metal     | ADD         | type=f32,ne=[4096,1,1,1],nr=[1,1,1,1]   |                        28.42 |                         28.45 |      1.00 |
| Metal     | ADD         | type=f32,ne=[4096,1,1,1],nr=[1,512,1,1] |                        86.60 |                         97.14 |      1.12 |

cd /Users/yexiaodong/go/src/github.com/ggerganov/llama.cpp && python3 scripts/compare-llama-bench.py -b ecd7fdb4c -c ecd7fdb4c --tool test-backend-ops -i ./test-backend-ops.sqlite                 
| Backend   | Operation   | Parameters                                                                       |   GFLOPS xd/test-backend-ops_sql |   GFLOPS xd/test-backend-ops_sql |   Speedup |
|:----------|:------------|:---------------------------------------------------------------------------------|---------------------------------:|---------------------------------:|----------:|
| Metal     | MUL_MAT     | type_a=f16,type_b=f32,m=128,n=1,k=16416,bs=[8,1],nr=[4,1],per=[0,1,2,3],v=1      |                           127.90 |                           127.90 |      1.00 |
| Metal     | MUL_MAT     | type_a=f16,type_b=f32,m=16416,n=1,k=128,bs=[8,1],nr=[4,1],per=[0,2,1,3],v=0      |                            33.98 |                            33.98 |      1.00 |
| Metal     | MUL_MAT     | type_a=f16,type_b=f32,m=4096,n=1,k=14336,bs=[1,1],nr=[1,1],per=[0,1,2,3],v=0     |                            57.91 |                            57.91 |      1.00 |
| Metal     | MUL_MAT     | type_a=f16,type_b=f32,m=4096,n=2,k=14336,bs=[1,1],nr=[1,1],per=[0,1,2,3],v=0     |                           115.00 |                           115.00 |      1.00 |

Generated Plot

[Copilot]

Pull Request Overview

This PR adds support for comparing performance results from both llama-bench and test-backend-ops by introducing tool-specific database schemas, CLI argument parsing, and formatting functions. Key changes include:

• Refactoring database field and key property definitions to support both tools.
• Updating table queries and input file handling based on a new --tool argument.
• Enhancing the CLI script (compare-commits.sh) to allow selection of the tool and additional arguments.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
scripts/compare-llama-bench.py	Adjusts SQLite table creation, queries, and result formatting for dual tool support.
scripts/compare-commits.sh	Updates argument parsing and build/run logic to handle multiple tools.