[llvm] [LLVM][CodeGen][AArch64] Replace tablegen based lowering of vector half/bfloat operations. (PR #190164)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/CodeGen/SelectionDAG/LegalizeVectorOps.cpp llvm/lib/Target/AArch64/AArch64ISelLowering.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index fb579e8ad..7541883e8 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -893,21 +893,21 @@ AArch64TargetLowering::AArch64TargetLowering(const TargetMachine &TM,
     setOperationPromotedToType(ISD::VECREDUCE_FMUL, V8Narrow, MVT::v8f32);
 
     setOperationAction(ISD::FABS,        V8Narrow, Legal);
-    setOperationAction(ISD::FADD,        V8Narrow, Expand);
-    setOperationAction(ISD::FCEIL,       V8Narrow, Expand);
+    setOperationAction(ISD::FADD, V8Narrow, Expand);
+    setOperationAction(ISD::FCEIL, V8Narrow, Expand);
     setOperationAction(ISD::FCOPYSIGN,   V8Narrow, Custom);
-    setOperationAction(ISD::FDIV,        V8Narrow, Expand);
-    setOperationAction(ISD::FFLOOR,      V8Narrow, Expand);
+    setOperationAction(ISD::FDIV, V8Narrow, Expand);
+    setOperationAction(ISD::FFLOOR, V8Narrow, Expand);
     setOperationAction(ISD::FMA,         V8Narrow, Expand);
-    setOperationAction(ISD::FMUL,        V8Narrow, Expand);
-    setOperationAction(ISD::FNEARBYINT,  V8Narrow, Expand);
+    setOperationAction(ISD::FMUL, V8Narrow, Expand);
+    setOperationAction(ISD::FNEARBYINT, V8Narrow, Expand);
     setOperationAction(ISD::FNEG,        V8Narrow, Legal);
-    setOperationAction(ISD::FROUND,      V8Narrow, Expand);
-    setOperationAction(ISD::FROUNDEVEN,  V8Narrow, Expand);
-    setOperationAction(ISD::FRINT,       V8Narrow, Expand);
+    setOperationAction(ISD::FROUND, V8Narrow, Expand);
+    setOperationAction(ISD::FROUNDEVEN, V8Narrow, Expand);
+    setOperationAction(ISD::FRINT, V8Narrow, Expand);
     setOperationAction(ISD::FSQRT,       V8Narrow, Expand);
-    setOperationAction(ISD::FSUB,        V8Narrow, Expand);
-    setOperationAction(ISD::FTRUNC,      V8Narrow, Expand);
+    setOperationAction(ISD::FSUB, V8Narrow, Expand);
+    setOperationAction(ISD::FTRUNC, V8Narrow, Expand);
     setOperationAction(ISD::BR_CC,       V8Narrow, Expand);
     setOperationAction(ISD::SELECT,      V8Narrow, Expand);
     setOperationAction(ISD::SELECT_CC,   V8Narrow, Expand);

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https://github.com/llvm/llvm-project/pull/190164