Make size() const noexcept

Signed-off-by: Larsen, Steffen <[email protected]>

Author: steffenlarsen

sycl/source/detail/kernel_program_cache.hpp

@@ -79,7 +79,7 @@ class KernelProgramCache {
     std::map<ProgramCacheKeyT, ProgramWithBuildStateT> Cache;
     std::multimap<CommonProgramKeyT, ProgramCacheKeyT> KeyMap;
 
-    size_t size() { return Cache.size(); }
+    size_t size() const noexcept { return Cache.size(); }
   };
 
   using ContextPtr = context_impl *;