Revert "[Instrumentation] Fix a warning"

This reverts commit de18ff3.
The initial commit for nsan needs to be reverted
for now because of the issue detected by
https://lab.llvm.org/buildbot/#/builders/11/builds/822.

Author: alexander-shaposhnikov

llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp

@@ -1529,7 +1529,6 @@ Value *NumericalStabilitySanitizer::maybeHandleKnownCallBase(
   assert(Intrinsic::matchIntrinsicSignature(WidenedFnTy, TableRef, ArgTys) ==
              Intrinsic::MatchIntrinsicTypes_Match &&
          "invalid widened intrinsic");
-  (void)TableRef;
   // For known intrinsic functions, we create a second call to the same
   // intrinsic with a different type.
   SmallVector<Value *, 4> Args;