[llvm] [NFC][RISCV] Move Zvfbf* relative stuffs to RISCVInstrInfoZvfbf.td (PR #159619)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clangd-ubuntu-tsan` running on `clangd-ubuntu-clang` while building `llvm` at step 5 "build-clangd-clangd-index-server-clangd-indexer".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/134/builds/26646

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

```
Step 5 (build-clangd-clangd-index-server-clangd-indexer) failure: build (failure)
...
1.160 [1/8/81] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/InfoByHwMode.cpp.o
1.161 [1/7/82] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/DAGISelMatcher.cpp.o
1.161 [1/6/83] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/OptEmitter.cpp.o
1.162 [1/5/84] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/PredicateExpander.cpp.o
1.162 [1/4/85] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/CodeGenTarget.cpp.o
1.163 [1/3/86] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/SubtargetFeatureInfo.cpp.o
1.164 [1/2/87] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/Utils.cpp.o
1.166 [1/1/88] Building CXX object utils/TableGen/Common/CMakeFiles/obj.LLVMTableGenCommon.dir/VarLenCodeEmitterGen.cpp.o
1.454 [0/1/89] Linking CXX executable bin/llvm-tblgen
18.752 [2544/2/846] Building RISCVTargetParserDef.inc...
FAILED: include/llvm/TargetParser/RISCVTargetParserDef.inc /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/include/llvm/TargetParser/RISCVTargetParserDef.inc 
cd /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/include/llvm/TargetParser && /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/NATIVE/bin/llvm-min-tblgen -gen-riscv-target-def -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/include/llvm/TargetParser -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Target/RISCV -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/include -I/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/include /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Target/RISCV/RISCV.td --write-if-changed -o RISCVTargetParserDef.inc -d RISCVTargetParserDef.inc.d && /usr/bin/cmake -E cmake_transform_depfile Ninja gccdepfile /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/include/llvm/TargetParser /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/include/llvm/TargetParser /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/include/llvm/TargetParser/RISCVTargetParserDef.inc.d /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/build/CMakeFiles/d/e356bf8589c61517c0a2fcf15dd7a406e72e07d84f2b959d3455e815fbda25a5.d
Included from /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Target/RISCV/RISCV.td:36:
Included from /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Target/RISCV/RISCVInstrInfo.td:2344:
Included from /vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Target/RISCV/RISCVInstrInfoV.td:1842:
/vol/worker/clangd-ubuntu-clang/clangd-ubuntu-tsan/llvm-project/llvm/lib/Target/RISCV/RISCVInstrInfoZvfbf.td:39:19: error: Variable not defined: 'HasStdExtZvfbfmin'
let Predicates = [HasStdExtZvfbfmin] in {
                  ^
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/159619