[llvm] [LLVM] Update the default value for MaxLargeFPConvertBitWidthSupported to 128 (PR #176851)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `llvm` at step 8 "Add check check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/21090

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 8 (Add check check-llvm) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/fptoi-256.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llc -mtriple=aarch64 < /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/CodeGen/fptoi-256.ll
# executed command: /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llc -mtriple=aarch64
# .---command stderr------------
# | /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llc: error: unable to get target for 'aarch64', see --version and --triple.
# `-----------------------------
# error: command failed with exit status: 1

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/176851