[compiler-rt] [compiler-rt] Fix test ifdefs and XFAILs (PR #160687)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c -- compiler-rt/test/builtins/Unit/fixunstfdi_test.c compiler-rt/test/builtins/Unit/multc3_test.c
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/compiler-rt/test/builtins/Unit/multc3_test.c b/compiler-rt/test/builtins/Unit/multc3_test.c
index 3d9a20e87..8b46698d0 100644
--- a/compiler-rt/test/builtins/Unit/multc3_test.c
+++ b/compiler-rt/test/builtins/Unit/multc3_test.c
@@ -1,8 +1,8 @@
 // RUN: %clang_builtins %s %librt -o %t && %run %t
 // REQUIRES: librt_has_multc3
 
-#include <stdio.h>
 #include "int_lib.h"
+#include <stdio.h>
 
 #if defined(CRT_HAS_128BIT) && defined(CRT_HAS_F128)
 

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https://github.com/llvm/llvm-project/pull/160687