[SYCL] Avoid double map lookup in the ProgramManager::getEliminatedKernelArg… (#18318)

A simple fix to avoid a second hash map lookup in the the
`ProgramManager::getEliminatedKernelArgMask` function

Signed-off-by: Sergei Vinogradov <[email protected]>

Author: vinser52

sycl/source/detail/program_manager/program_manager.cpp

@@ -2359,7 +2359,7 @@ ProgramManager::getEliminatedKernelArgMask(ur_program_handle_t NativePrg,
         continue;
       auto ArgMaskMapIt = MapIt->second.find(KernelName);
       if (ArgMaskMapIt != MapIt->second.end())
-        return &MapIt->second[KernelName];
+        return &ArgMaskMapIt->second;
     }
     if (Range.first != Range.second)
       return nullptr;