[libunwind] [libunwind] Use consistent indentation in `__libunwind_config.h` (PR #152861)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h -- libunwind/include/__libunwind_config.h
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/libunwind/include/__libunwind_config.h b/libunwind/include/__libunwind_config.h
index bf29132a8..0855b2217 100644
--- a/libunwind/include/__libunwind_config.h
+++ b/libunwind/include/__libunwind_config.h
@@ -136,16 +136,18 @@
 #    error "Unsupported MIPS ABI and/or environment"
 #  endif
 #  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_MIPS
-# elif defined(__sparc__) && defined(__arch64__)
-#  define _LIBUNWIND_TARGET_SPARC64 1
-#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER LIBUNWIND_HIGHEST_DWARF_REGISTER_SPARC64
-#  define _LIBUNWIND_CONTEXT_SIZE 33
-#  define _LIBUNWIND_CURSOR_SIZE 45
+#elif defined(__sparc__) && defined(__arch64__)
+#define _LIBUNWIND_TARGET_SPARC64 1
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER                                      \
+  LIBUNWIND_HIGHEST_DWARF_REGISTER_SPARC64
+#define _LIBUNWIND_CONTEXT_SIZE 33
+#define _LIBUNWIND_CURSOR_SIZE 45
 # elif defined(__sparc__)
-#  define _LIBUNWIND_TARGET_SPARC 1
-#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_SPARC
-#  define _LIBUNWIND_CONTEXT_SIZE 16
-#  define _LIBUNWIND_CURSOR_SIZE 23
+#define _LIBUNWIND_TARGET_SPARC 1
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER                                      \
+  _LIBUNWIND_HIGHEST_DWARF_REGISTER_SPARC
+#define _LIBUNWIND_CONTEXT_SIZE 16
+#define _LIBUNWIND_CURSOR_SIZE 23
 # elif defined(__riscv)
 #  define _LIBUNWIND_TARGET_RISCV 1
 #  if defined(__riscv_flen)
@@ -161,7 +163,8 @@
 #  else
 #   error "Unsupported RISC-V ABI"
 #  endif
-#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_RISCV
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER                                      \
+  _LIBUNWIND_HIGHEST_DWARF_REGISTER_RISCV
 # elif defined(__ve__)
 #  define _LIBUNWIND_TARGET_VE 1
 #  define _LIBUNWIND_CONTEXT_SIZE 67
@@ -172,19 +175,20 @@
 #  define _LIBUNWIND_CONTEXT_SIZE 34
 #  define _LIBUNWIND_CURSOR_SIZE 46
 #  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_S390X
-# elif defined(__loongarch__)
-#  define _LIBUNWIND_TARGET_LOONGARCH 1
-#  if __loongarch_grlen == 64
-#   define _LIBUNWIND_CONTEXT_SIZE 65
-#   define _LIBUNWIND_CURSOR_SIZE 77
-#  else
-#   error "Unsupported LoongArch ABI"
-#  endif
-#  define _LIBUNWIND_HIGHEST_DWARF_REGISTER _LIBUNWIND_HIGHEST_DWARF_REGISTER_LOONGARCH
-# elif defined(__wasm__)
+#elif defined(__loongarch__)
+#define _LIBUNWIND_TARGET_LOONGARCH 1
+#if __loongarch_grlen == 64
+#define _LIBUNWIND_CONTEXT_SIZE 65
+#define _LIBUNWIND_CURSOR_SIZE 77
+#else
+#error "Unsupported LoongArch ABI"
+#endif
+#define _LIBUNWIND_HIGHEST_DWARF_REGISTER                                      \
+  _LIBUNWIND_HIGHEST_DWARF_REGISTER_LOONGARCH
+#elif defined(__wasm__)
 // Unused
-#  define _LIBUNWIND_CONTEXT_SIZE 0
-#  define _LIBUNWIND_CURSOR_SIZE 0
+#define _LIBUNWIND_CONTEXT_SIZE 0
+#define _LIBUNWIND_CURSOR_SIZE 0
 # else
 #  error "Unsupported architecture."
 # endif

``````````

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https://github.com/llvm/llvm-project/pull/152861