[llvm] [TLI] Add basic support for fdim libcall (PR #108702)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx64-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 6 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/160/builds/5432

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

```
Step 6 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM :: tools/llvm-tli-checker/ps4-tli-check.yaml' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 4: /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/bin/yaml2obj /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml -DTYPE=ET_REL -DLABEL=Symbols -DZDAPV=_ZdaPv -o=/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/test/tools/llvm-tli-checker/Output/ps4-tli-check.yaml.tmp1
+ /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/bin/yaml2obj /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml -DTYPE=ET_REL -DLABEL=Symbols -DZDAPV=_ZdaPv -o=/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/test/tools/llvm-tli-checker/Output/ps4-tli-check.yaml.tmp1
RUN: at line 5: llvm-tli-checker --triple=x86_64-scei-ps4 /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/test/tools/llvm-tli-checker/Output/ps4-tli-check.yaml.tmp1 | /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/bin/FileCheck /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml
+ llvm-tli-checker --triple=x86_64-scei-ps4 /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/test/tools/llvm-tli-checker/Output/ps4-tli-check.yaml.tmp1
+ /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/bin/FileCheck /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml
/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml:37:10: error: CHECK: expected string not found in input
# CHECK: == Total TLI yes SDK yes: 253
         ^
<stdin>:25:27: note: scanning from here
>> Total TLI no SDK yes: 0
                          ^
<stdin>:26:1: note: possible intended match here
== Total TLI yes SDK yes: 256
^

Input file: <stdin>
Check file: /home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/llvm-project/llvm/test/tools/llvm-tli-checker/ps4-tli-check.yaml

-dump-input=help explains the following input dump.

Input was:
<<<<<<
            .
            .
            .
           20: << TLI yes SDK no : 'fmaximum_numl' 
           21: << TLI yes SDK no : 'fminimum_num' 
           22: << TLI yes SDK no : 'fminimum_numf' 
           23: << TLI yes SDK no : 'fminimum_numl' 
           24: << Total TLI yes SDK no: 18 
           25: >> Total TLI no SDK yes: 0 
check:37'0                               X error: no match found
           26: == Total TLI yes SDK yes: 256 
check:37'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
check:37'1     ?                              possible intended match
           27: FAIL: LLVM TLI doesn't match SDK libraries. 
check:37'0     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>>>>>

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/108702