Minor cleanup.

Author: dan-zheng

lib/SIL/SILDifferentiabilityWitness.cpp

@@ -12,9 +12,7 @@
 
 #define DEBUG_TYPE "sil-differentiability-witness"
 
-// SWIFT_ENABLE_TENSORFLOW
 #include "swift/AST/ASTMangler.h"
-// SWIFT_ENABLE_TENSORFLOW_END
 #include "swift/SIL/SILDifferentiabilityWitness.h"
 #include "swift/SIL/SILModule.h"
 
@@ -51,7 +49,6 @@ SILDifferentiabilityWitness *SILDifferentiabilityWitness::createDefinition(
       derivativeGenSig, jvp, vjp, /*isDeclaration*/ false, isSerialized,
       attribute);
   // Register the differentiability witness in the module.
-  // Register the differentiability witness in the module.
   Mangle::ASTMangler mangler;
   auto mangledKey =
       mangler.mangleSILDifferentiabilityWitnessKey(diffWitness->getKey());