Make user range rounding preference override -O0

Range rounding is disabled for -O0 but now a user preference for range rounding can
override this.

Author: hdelan

clang/lib/Driver/ToolChains/Clang.cpp

@@ -5454,7 +5454,10 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     bool DisableRangeRounding = false;
     if (Arg *A = Args.getLastArg(options::OPT_O_Group)) {
       if (A->getOption().matches(options::OPT_O0))
-        DisableRangeRounding = true;
+        // If the user has set some range rounding preference then let that
+        // override not range rounding at -O0
+        if (!Args.getLastArg(options::OPT_fsycl_range_rounding_EQ))
+          DisableRangeRounding = true;
     }
     if (DisableRangeRounding || HasFPGA)
       CmdArgs.push_back("-fsycl-range-rounding=disable");