[LV] Remove FIXME about NoImplicitFloat. NFC

[craig.topper]

Summary

My understanding is that NoImplicitFloat, despite it's name, is
supposed to disable all vectors not just float vectors.

[efriedma]

LGTM

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

else {
             "loop trip count is too low, avoiding vectorization",
             "LowTripCount", ORE, L);
         Hints.emitRemarkWithHints();
         return false;
       }
     }
   }
 
-  // Check the function attributes to see if implicit floats are allowed.
-  // FIXME: This check doesn't seem possibly correct -- what if the loop is
-  // an integer loop and the vector instructions selected are purely integer
-  // vector instructions?
+  // Check the function attributes to see if implicit floats or vectors are
+  // allowed.
   if (F->hasFnAttribute(Attribute::NoImplicitFloat)) {
     reportVectorizationFailure(
         "Can't vectorize when the NoImplicitFloat attribute is used",
         "loop not vectorized due to NoImplicitFloat attribute",
         "NoImplicitFloat", ORE, L);
     Hints.emitRemarkWithHints();
     return false;
   }