[clang] [CIR][X86] Implement xsave/xrstor builtins Fixes part of #167752 (PR #170877)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,c -- clang/test/CIR/CodeGenBuiltins/X86/xsave-builtins.c clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp --diff_from_common_commit
``````````

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in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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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 be0bf5832..850aa0ecb 100644
--- a/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
+++ b/clang/lib/CIR/CodeGen/CIRGenBuiltinX86.cpp
@@ -589,8 +589,8 @@ mlir::Value CIRGenFunction::emitX86BuiltinExpr(unsigned builtinID,
 
     // Mhi = (uint32_t)(ops[1] >> 32) - extract high 32 bits via right shift
     cir::ConstantOp shift32 = builder.getSInt64(32, loc);
-    mlir::Value mhi =
-        builder.createShift(loc, ops[1], shift32.getResult(), /*isShiftLeft=*/false);
+    mlir::Value mhi = builder.createShift(loc, ops[1], shift32.getResult(),
+                                          /*isShiftLeft=*/false);
     mhi = builder.createIntCast(mhi, i32Ty);
 
     // Mlo = (uint32_t)ops[1] - extract low 32 bits by truncation

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https://github.com/llvm/llvm-project/pull/170877