[AMDGPU] Fix santizer error after last commit

Removed useless assert.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310738 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/AMDGPU/AMDGPULibCalls.cpp

@@ -1303,7 +1303,6 @@ BasicBlock::iterator AMDGPULibCalls::getEntryIns(CallInst * UI) {
   BasicBlock * BB = &Func->getEntryBlock();
   assert(BB && "Entry block not found!");
   BasicBlock::iterator ItNew = BB->begin();
-  assert(&*ItNew && "Entry instruction not found!");
   return ItNew;
 }