[libc][math] Add Missing math functions to math.yaml

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good first issuelibc

仓库指标

Some of the missing functions

Trigonometric Functions: https://github.com/llvm/llvm-project/pull/199442
- acospif
- atan2f16
Error, Gamma Functions and fma: https://github.com/llvm/llvm-project/pull/199485
- dfmaf128
- dfmal
Canonical : https://github.com/llvm/llvm-project/pull/199317
- iscanonical
- iscanonicalf
- iscanonicalf128
- iscanonicalf16
- iscanonicall
Signaling: https://github.com/llvm/llvm-project/pull/199357
- issignaling
- issignalingf
- issignalingf128
- issignalingf16
- issignalingl

Feel free to add any additional missing functions apart from this. Make sure to adhere to LLVM AI Tool Use Policy.

研究方向: Examine the linked pull requests (#199442, #199485, #199317, #199357) for examples of how similar functions were added. Look at the file libc/spec/math.yaml to understand the YAML format. Identify a function not yet listed and follow the pattern to add its specification. Ensure compliance with LLVM AI Tool Use Policy.
技术栈: ccpp
领域: backend
议题类型: 功能
难度: 3
预计时间: 1-2 天
活动状态: 活跃
清晰度: 清晰
前置要求: familiarity with LLVM libc structureC/C++ knowledge
新手友好度: 60