[llvm] [Support][Windows] disk_space handle unicode paths (PR #170716)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,inc -- llvm/lib/Support/CachePruning.cpp llvm/lib/Support/Windows/Path.inc --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/Support/CachePruning.cpp b/llvm/lib/Support/CachePruning.cpp
index c3a190bd3..2210e0c31 100644
--- a/llvm/lib/Support/CachePruning.cpp
+++ b/llvm/lib/Support/CachePruning.cpp
@@ -281,7 +281,8 @@ bool llvm::pruneCache(StringRef Path, CachePruningPolicy Policy,
     auto ErrOrSpaceInfo = sys::fs::disk_space(Path);
     if (!ErrOrSpaceInfo) {
       auto EC = ErrOrSpaceInfo.getError();
-      report_fatal_error("Can't get available size for '" + Path.str() + "': " + EC.message());
+      report_fatal_error("Can't get available size for '" + Path.str() +
+                         "': " + EC.message());
     }
     sys::fs::space_info SpaceInfo = ErrOrSpaceInfo.get();
     auto AvailableSpace = TotalSize + SpaceInfo.free;
diff --git a/llvm/lib/Support/Windows/Path.inc b/llvm/lib/Support/Windows/Path.inc
index a133b3ddd..717a124f9 100644
--- a/llvm/lib/Support/Windows/Path.inc
+++ b/llvm/lib/Support/Windows/Path.inc
@@ -179,7 +179,7 @@ ErrorOr<space_info> disk_space(const Twine &Path) {
     return mapWindowsError(::GetLastError());
 
   space_info SpaceInfo;
-  SpaceInfo.capacity  = Total.QuadPart;
+  SpaceInfo.capacity = Total.QuadPart;
   SpaceInfo.free = Free.QuadPart;
   SpaceInfo.available = Avail.QuadPart;
 

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https://github.com/llvm/llvm-project/pull/170716