[ubsan] Limit _BitInt ubsan tests to x86-64 platform only (llvm#104494)

The patch llvm#104462 broke Sun
Solaris build.
Limit the tests to the tested platform only.
Tests changed are
compiler-rt/test/ubsan/TestCases/Integer/bit-int-pass.c and
compiler-rt/test/ubsan/TestCases/Integer/bit-int.c

---------

Co-authored-by: Eänolituri Lómitaurë <vladislav.aranov@ericsson.com>
Co-authored-by: Aaron Ballman <aaron@aaronballman.com>
Co-authored-by: Paul Kirth <paulkirth@google.com>
Co-authored-by: Vitaly Buka <vitalybuka@gmail.com>

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

@@ -1,3 +1,4 @@
+// REQUIRES: x86_64-target-arch
 // 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=alignment,array-bounds,bool,float-cast-overflow,implicit-integer-sign-change,implicit-signed-integer-truncation,implicit-unsigned-integer-truncation,integer-divide-by-zero,nonnull-attribute,null,nullability-arg,nullability-assign,nullability-return,pointer-overflow,returns-nonnull-attribute,shift-base,shift-exponent,signed-integer-overflow,unreachable,unsigned-integer-overflow,unsigned-shift-base,vla-bound %s -o %t1 && %run %t1 2>&1 | FileCheck %s
 
 #include <stdint.h>

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

@@ -1,5 +1,9 @@
+// REQUIRES: x86_64-target-arch
 // 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>