[llvm] [RISCV] Add helper method for detecting BEXTI or TH_TST is supported. NFC (PR #157915)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/RISCV/RISCVSubtarget.h
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVSubtarget.h b/llvm/lib/Target/RISCV/RISCVSubtarget.h
index 9baaa9d34..50e76df56 100644
--- a/llvm/lib/Target/RISCV/RISCVSubtarget.h
+++ b/llvm/lib/Target/RISCV/RISCVSubtarget.h
@@ -186,9 +186,7 @@ public:
     return HasStdExtZfhmin || HasStdExtZfbfmin;
   }
 
-  bool hasBEXTILike() const {
-    return HasStdExtZbs || HasVendorXTHeadBs;
-  }
+  bool hasBEXTILike() const { return HasStdExtZbs || HasVendorXTHeadBs; }
 
   bool hasCZEROLike() const {
     return HasStdExtZicond || HasVendorXVentanaCondOps;

``````````

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https://github.com/llvm/llvm-project/pull/157915