[xen staging] xen/compiler: drop alternative unreachable() definition for older GCC

[patchbot@xxxxxxx]

commit 900d422775720dfd659834bdaf52db4b98ba4529
Author:     Nicola Vetrini <nicola.vetrini@xxxxxxxxx>
AuthorDate: Thu Aug 14 11:36:27 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Aug 14 11:36:27 2025 +0200

    xen/compiler: drop alternative unreachable() definition for older GCC
    
    The GCC baseline version is 5.1, which supports __builtin_unreachable(),
    therefore the alternative definition can be dropped
    
    Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/include/xen/compiler.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/xen/include/xen/compiler.h b/xen/include/xen/compiler.h
index 735c844d2d..88bf26bc51 100644
--- a/xen/include/xen/compiler.h
+++ b/xen/include/xen/compiler.h
@@ -47,11 +47,7 @@
 # define cf_check
 #endif
 
-#if (!defined(__clang__) && (__GNUC__ == 4) && (__GNUC_MINOR__ < 5))
-#define unreachable() do {} while (1)
-#else
 #define unreachable() __builtin_unreachable()
-#endif
 
 /*
  * Compilers estimate the size of an asm() block for inlining purposes.
--
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