[llvm] [AArch64] Update reserve-regs-for-regalloc desc (PR #173799)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AArch64/AArch64Subtarget.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
index d8db5724d..cf6ebb4ba 100644
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -59,12 +59,13 @@ static cl::opt<unsigned> OverrideVectorInsertExtractBaseCost(
 // Reserve a list of X# registers, so they are unavailable for register
 // allocator, but can still be used as ABI requests, such as passing arguments
 // to function call.
-static cl::list<std::string>
-ReservedRegsForRA("reserve-regs-for-regalloc", cl::desc("Reserve physical "
-                  "registers, so they can't be used by register allocator. "
-                  "Should be used for testing regalloc, or for exposing a "
-                  "regalloc reservation feature which is not a guarantee."),
-                  cl::CommaSeparated, cl::Hidden);
+static cl::list<std::string> ReservedRegsForRA(
+    "reserve-regs-for-regalloc",
+    cl::desc("Reserve physical "
+             "registers, so they can't be used by register allocator. "
+             "Should be used for testing regalloc, or for exposing a "
+             "regalloc reservation feature which is not a guarantee."),
+    cl::CommaSeparated, cl::Hidden);
 
 static cl::opt<AArch64PAuth::AuthCheckMethod>
     AuthenticatedLRCheckMethod("aarch64-authenticated-lr-check-method",

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https://github.com/llvm/llvm-project/pull/173799