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

This fixes the ifdefs added in
e9e166e; we need to include int_lib.h
first before we can expect these defines to be set.

Also remove the XFAILs for aarch64 windows. As this test now became a
no-op on platforms that lack CRT_HAS_128BIT or CRT_HAS_F128 (aarch64
windows lacks the latter), it no longer fails.

Author: mstorsjo

compiler-rt/test/builtins/Unit/fixunstfdi_test.c

@@ -1,16 +1,14 @@
-// XFAIL: target=aarch64-{{.*}}-windows-{{.*}}
 // RUN: %clang_builtins %s %librt -o %t && %run %t
 // REQUIRES: librt_has_fixunstfdi
 
 #include <stdio.h>
+#include "int_lib.h"
 
 #if defined(CRT_HAS_TF_MODE)
 
 #define QUAD_PRECISION
 #include "fp_lib.h"
 
-#include "int_lib.h"
-
 // Returns: convert a to a unsigned long long, rounding toward zero.
 //          Negative values all become zero.
 

compiler-rt/test/builtins/Unit/multc3_test.c

@@ -1,15 +1,14 @@
-// XFAIL: target=aarch64-{{.*}}-windows-{{.*}}
 // RUN: %clang_builtins %s %librt -o %t && %run %t
 // REQUIRES: librt_has_multc3
 
 #include <stdio.h>
+#include "int_lib.h"
 
 #if defined(CRT_HAS_128BIT) && defined(CRT_HAS_F128)
 
 #define QUAD_PRECISION
 #include "fp_lib.h"
 
-#include "int_lib.h"
 #include <math.h>
 #include <complex.h>