[clang] [CIR][X86] Implement convert_half builtin (PR #171615)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/CIR/CodeGen/X86/cir-convert-half.c clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp b/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
index ddf6d7060..41386e5ad 100644
--- a/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
@@ -1623,7 +1623,8 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned builtinID,
   }
   case X86::BI__builtin_ia32_cvtneps2bf16_128_mask: {
     mlir::Location loc = getLoc(expr->getExprLoc());
-    return emitIntrinsicCallOp(builder, loc, "x86.avx512bf16.mask.cvtneps2bf16.128",
+    return emitIntrinsicCallOp(builder, loc,
+                               "x86.avx512bf16.mask.cvtneps2bf16.128",
                                convertType(expr->getType()), ops);
   }
   case X86::BI__builtin_ia32_cvtneps2bf16_256_mask: {

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https://github.com/llvm/llvm-project/pull/171615