[NFC][BoundsChecking] Address #122576 review comments (#122773)

Author: vitalybuka

Diff for: clang/lib/CodeGen/BackendUtil.cpp

@@ -1032,7 +1032,8 @@ void EmitAssemblyHelper::RunOptimizationPipeline(
           static_assert(SanitizerKind::SO_LocalBounds <=
                             std::numeric_limits<
                                 decltype(Options.GuardKind)::value_type>::max(),
-                        "Update type of llvm.allow.ubsan.check.");
+                        "Update type of llvm.allow.ubsan.check to represent "
+                        "SanitizerKind::SO_LocalBounds.");
           Options.GuardKind = SanitizerKind::SO_LocalBounds;
         }
         Options.Merge =

Diff for: llvm/lib/Passes/PassBuilder.cpp

@@ -1320,7 +1320,7 @@ parseBoundsCheckingOptions(StringRef Params) {
       StringRef ParamEQ;
       StringRef Val;
       std::tie(ParamEQ, Val) = ParamName.split('=');
-      int8_t Id = 0;
+      int8_t Id;
       if (ParamEQ == "guard" && !Val.getAsInteger(0, Id)) {
         Options.GuardKind = Id;
       } else {