[llvm] [RISCV][TTI] Use processShuffleMask for shuffle legalization estimate (PR #136191)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-arm-ubuntu` running on `linaro-lldb-arm-ubuntu` while building `llvm` at step 4 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/18/builds/14871

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

```
Step 4 (build) failure: build (failure)
...
27.978 [839/12/5763] Building AMDGPUGenAsmMatcher.inc...
28.090 [839/11/5764] Linking CXX executable bin/clang-refactor
28.125 [839/10/5765] Linking CXX shared module lib/SampleAnalyzerPlugin.so
28.135 [839/9/5766] Linking CXX shared module lib/CheckerDependencyHandlingAnalyzerPlugin.so
28.276 [839/8/5767] Linking CXX shared module lib/CheckerOptionHandlingAnalyzerPlugin.so
29.075 [839/7/5768] Building AMDGPUGenGlobalISel.inc...
29.289 [839/6/5769] Building AMDGPUGenInstrInfo.inc...
32.159 [839/5/5770] Building AMDGPUGenRegisterBank.inc...
35.850 [839/4/5771] Building AMDGPUGenRegisterInfo.inc...
41.277 [838/4/5772] Building CXX object lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVTargetTransformInfo.cpp.o
FAILED: lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVTargetTransformInfo.cpp.o 
/usr/local/bin/c++ -DGTEST_HAS_RTTI=0 -D_DEBUG -D_FILE_OFFSET_BITS=64 -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/lib/Target/RISCV -I/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/llvm/lib/Target/RISCV -I/home/tcwg-buildbot/worker/lldb-arm-ubuntu/build/include -I/home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/llvm/include -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -std=c++17 -fvisibility=hidden  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -MD -MT lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVTargetTransformInfo.cpp.o -MF lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVTargetTransformInfo.cpp.o.d -o lib/Target/RISCV/CMakeFiles/LLVMRISCVCodeGen.dir/RISCVTargetTransformInfo.cpp.o -c /home/tcwg-buildbot/worker/lldb-arm-ubuntu/llvm-project/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
../llvm-project/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp:710:11: error: no matching function for call to 'costShuffleViaSplitting'
  710 |           costShuffleViaSplitting(*this, LT.second, FVTp, Mask, CostKind);
      |           ^~~~~~~~~~~~~~~~~~~~~~~
../llvm-project/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp:392:24: note: candidate function not viable: 1st argument ('const llvm::RISCVTTIImpl') would lose const qualifier
  392 | static InstructionCost costShuffleViaSplitting(RISCVTTIImpl &TTI, MVT LegalVT,
      |                        ^                       ~~~~~~~~~~~~~~~~~
1 error generated.
42.158 [838/3/5773] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/AsmPrinter.cpp.o
47.491 [838/2/5774] Building CXX object lib/LTO/CMakeFiles/LLVMLTO.dir/LTO.cpp.o
51.984 [838/1/5775] Building InstCombineTables.inc...
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/136191