[SYCL][NFC] Remove dead code (#7884)

Minor fixes I noticed while browsing the code.

Author: bader

clang/lib/Driver/Driver.cpp

@@ -5067,7 +5067,6 @@ class OffloadingActionBuilder final {
 
     // Return whether to use native bfloat16 library.
     bool selectBfloatLibs(const ToolChain *TC, bool &useNative) {
-      const OptTable &Opts = C.getDriver().getOpts();
       const char *TargetOpt = nullptr;
       const char *DeviceOpt = nullptr;
       bool needLibs = false;

clang/lib/Driver/ToolChains/SYCL.h

@@ -175,7 +175,7 @@ class LLVM_LIBRARY_VISIBILITY SYCLToolChain : public ToolChain {
 
   bool useIntegratedAs() const override { return true; }
   bool isPICDefault() const override { return false; }
-  bool isPIEDefault(const llvm::opt::ArgList &Args) const override {\
+  bool isPIEDefault(const llvm::opt::ArgList &Args) const override {
     return false;
   }
   bool isPICDefaultForced() const override { return false; }

clang/lib/Frontend/CompilerInstance.cpp

@@ -146,7 +146,6 @@ bool CompilerInstance::createTarget() {
     return false;
 
   // Inform the target of the language options.
-  //
   // FIXME: We shouldn't need to do this, the target should be immutable once
   // created. This complexity should be lifted elsewhere.
   getTarget().adjust(getDiagnostics(), getLangOpts());