[SYCL][NATIVECPU] remove unneeded SYCLIsNativeCPU LangOpt (#19486)

This field is no longer referenced by Native CPU.

Author: uwedolinsky

clang/include/clang/Basic/LangOptions.def

@@ -327,7 +327,6 @@ ENUM_LANGOPT(SYCLRangeRounding, SYCLRangeRoundingPreference, 2,
 LANGOPT(SYCLExperimentalRangeRounding, 1, 0, "Use experimental parallel for range rounding")
 LANGOPT(SYCLEnableIntHeaderDiags, 1, 0, "Enable diagnostics that require the "
         "SYCL integration header")
-LANGOPT(SYCLIsNativeCPU      , 1, 0, "Generate code for SYCL Native CPU")
 LANGOPT(SYCLRTCMode, 1, 0, "Compile in RTC mode")
 
 LANGOPT(HIPUseNewLaunchAPI, 1, 0, "Use new kernel launching API for HIP")