rename parameter

Created using spr 1.3.6
diff --git a/llvm/include/llvm/Support/FileSystem.h b/llvm/include/llvm/Support/FileSystem.h
index 88299ca..7922400 100644
--- a/llvm/include/llvm/Support/FileSystem.h
+++ b/llvm/include/llvm/Support/FileSystem.h
@@ -641,7 +641,7 @@
                                 bool follow = true);
 
 /// A version for when a file handle is already available.
-LLVM_ABI std::error_code status(file_t FD, file_status &Result);
+LLVM_ABI std::error_code status(file_t F, file_status &Result);
 
 #ifdef _WIN32
 /// A version for when a file descriptor is already available.