[clang][bytecode][test] Disable a bitcast test on s390x

[tbaederr]

Fixes #160374

[llvmbot]

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

Changes

Fixes #160374

---

Full diff: https://github.com/llvm/llvm-project/pull/160452.diff

1 Files Affected:

• (modified) clang/test/AST/ByteCode/builtin-bit-cast.cpp (+3)

diff --git a/clang/test/AST/ByteCode/builtin-bit-cast.cpp b/clang/test/AST/ByteCode/builtin-bit-cast.cpp
index a12f305caf877..c1d29b2ca4c00 100644
--- a/clang/test/AST/ByteCode/builtin-bit-cast.cpp
+++ b/clang/test/AST/ByteCode/builtin-bit-cast.cpp
@@ -556,6 +556,8 @@ namespace VectorCast {
   }
   static_assert(test2() == 0);
 
+  /// On s390x, S is only 8 bytes.
+#if !defined(__s390x__)
   struct S {
     unsigned __int128 a : 3;
   };
@@ -569,6 +571,7 @@ namespace VectorCast {
   static_assert(s.a == 0); // ref-error {{not an integral constant expression}} \
                            // ref-note {{initializer of 's' is not a constant expression}}
 #endif
+#endif
 }
 #endif