[MLIR][AMDGPU] Fix typo and add comment to SerializeToHsaco

[bondhugula]

Thanks!

mlir/lib/Dialect/GPU/Transforms/SerializeToHsaco.cpp

242

Terminate comment with full stop.

mlir/lib/Dialect/GPU/Transforms/SerializeToHsaco.cpp

auto *constant = new GlobalVariable(
         /*threadLocalMode=*/GlobalVariable::ThreadLocalMode::NotThreadLocal,
         /*addressSpace=*/4);
     constant->setUnnamedAddr(GlobalVariable::UnnamedAddr::Local);
     constant->setVisibility(
         GlobalVariable::VisibilityTypes::ProtectedVisibility);
     constant->setAlignment(llvm::MaybeAlign(bitwidth / 8));
   };
 
+  // Set up control variables in the module instead of linking in tiny bitcode
   if (needOcml) {
     // TODO(kdrewnia): Enable math optimizations once we have support for
     // `-ffast-math`-like options
     addControlConstant("__oclc_finite_only_opt", 0, 8);
     addControlConstant("__oclc_daz_opt", 0, 8);
     addControlConstant("__oclc_correctly_rounded_sqrt32", 1, 8);
     addControlConstant("__oclc_unsafe_math_opt", 0, 8);
   }
SerializeToHsacoPass::translateToLLVMIR(llvm::LLVMContext &llvmContext) {
   Optional<SmallVector<std::unique_ptr<llvm::Module>, 3>> mbModules;
   std::string theRocmPath = getRocmPath();
   llvm::SmallString<32> bitcodePath(std::move(theRocmPath));
   llvm::sys::path::append(bitcodePath, "amdgcn", "bitcode");
   mbModules = loadLibraries(bitcodePath, libraries, llvmContext);
 
   if (!mbModules) {
     getOperation()
-            .emitWarning("Could not load required device labraries")
+            .emitWarning("Could not load required device libraries")
             .attachNote()
         << "This will probably cause link-time or run-time failures";
     return ret; // We can still abort here
   }
 
   llvm::Linker linker(*ret);
   for (std::unique_ptr<llvm::Module> &libModule : mbModules.getValue()) {
     // This bitcode linking code is substantially similar to what is used in