[libspirv] Fix atomic_xchg declarations. (#18647)

hvdijk · web-flow · commit 1dbfc101a7c7 · 2025-05-23T14:44:31.000+02:00
This fixes build errors seen after #18613 in NativeCPU and AMD.
diff --git a/libclc/libspirv/include/libspirv/atomic/atomic_xchg.h b/libclc/libspirv/include/libspirv/atomic/atomic_xchg.h
@@ -6,6 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#define __SPIRV_FUNCTION __spirv_AtomicExchange
 #define __SPIRV_FUNCTION_S __spirv_AtomicExchange
 #define __SPIRV_FUNCTION_U __spirv_AtomicExchange
 #define __SPIRV_INT64_BASE
