Require !windows instead of XFAIL'ing ubsan/TestCases/Integer/bit-int.c

The test would unexpectedly pass on Windows when there's 128-bit runtime
routines available. See comment on #104494

Author: zmodem

compiler-rt/test/ubsan/TestCases/Integer/bit-int.c

@@ -1,9 +1,7 @@
 // REQUIRES: x86_64-target-arch
+// REQUIRES: !windows
 // RUN: %clang -Wno-constant-conversion -Wno-array-bounds -Wno-division-by-zero -Wno-shift-negative-value -Wno-shift-count-negative -Wno-int-to-pointer-cast -O0 -fsanitize=array-bounds,float-cast-overflow,implicit-integer-sign-change,implicit-signed-integer-truncation,implicit-unsigned-integer-truncation,integer-divide-by-zero,pointer-overflow,shift-base,shift-exponent,signed-integer-overflow,unsigned-integer-overflow,unsigned-shift-base,vla-bound %s -o %t1 && %run %t1 2>&1 | FileCheck %s
 
-// FIXME: make the test pass on windows.
-// XFAIL: target={{.*windows-msvc.*}}
-
 #include <stdint.h>
 #include <stdio.h>