[X86] Remove x86_sse42_crc32_64_64 from X86TTIImpl::simplifyDemandedUseBitsIntrinsic

It doesn't do any simplifying. It just computes known bits. We
can just let InstCombine call computeKnownBits which will handle
this just as well.

diff --git a/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp b/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
index 91341f9..aea355a 100644 (file)
--- a/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
+++ b/llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
@@ -1785,10 +1785,6 @@ Optional<Value *> X86TTIImpl::simplifyDemandedUseBitsIntrinsic(
     KnownBitsComputed = true;
     break;
   }
-  case Intrinsic::x86_sse42_crc32_64_64:
-    Known.Zero.setBitsFrom(32);
-    KnownBitsComputed = true;
-    break;
   }
   return None;
 }