[llvm] [VPlan] Implement VPWidenCallRecipe::computeCost (NFCI). (PR #106047)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-aarch64-sve-vls-2stage` running on `linaro-g3-03` while building `llvm` at step 18 "test-suite".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/4/builds/1815

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

```
Step 18 (test-suite) failure: test (failure)
...
cd /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Fortran/gfortran/regression && /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage2.install/bin/llvm-size --format=sysv /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Fortran/gfortran/regression/gfortran-regression-execute-regression__widechar_intrinsics_5_f90 > /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Fortran/gfortran/regression/gfortran-regression-execute-regression__widechar_intrinsics_5_f90.size
gmake[2]: Leaving directory '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build'
[ 36%] Built target gfortran-regression-execute-regression__widechar_intrinsics_5_f90
gmake[1]: Leaving directory '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build'
gmake: *** [Makefile:136: all] Error 2

2024-09-01 16:38:36 INFO: Testing...
2024-09-01 16:38:36 INFO: Execute: /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/stage1/bin/llvm-lit -v -j 32 /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build -o /home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/outputi47f1v5p.json
-- Testing: 10005 tests, 32 workers --
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_1026.test (1 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_1026.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_1026' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_1028.test (2 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_1028.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_1028' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_366.test (3 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_366.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_366' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_1027.test (4 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_1027.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_1027' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_367.test (5 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_367.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_367' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_38.test (6 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_38.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_38' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_698.test (7 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_698.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_698' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_add_1029.test (8 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_add_1029.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_add_1029' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_add_1030.test (9 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_add_1030.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_add_1030' is missing
********************
NOEXE: test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_697.test (10 of 10005)
******************** TEST 'test-suite :: Bitcode/simd_ops/simd_ops_test_op_abs_697.test' FAILED ********************
Executable '/home/tcwg-buildbot/worker/clang-aarch64-sve-vls-2stage/test/sandbox/build/Bitcode/simd_ops/simd_ops_test_op_abs_697' is missing
********************

```

</details>

https://github.com/llvm/llvm-project/pull/106047