Inline memset when there is a constant value and count.

src/IceInstX86BaseImpl.h

Index: src/IceInstX86BaseImpl.h
diff --git a/src/IceInstX86BaseImpl.h b/src/IceInstX86BaseImpl.h
index f80073e638735206c7f258eb0a2768126050e516..a8a0a1f61ef79f0c6b2659c0c43166c3e4226c25 100644
--- a/src/IceInstX86BaseImpl.h
+++ b/src/IceInstX86BaseImpl.h
@@ -2137,6 +2137,7 @@ void InstX86StoreP<Machine>::emit(const Cfg *Func) const {
     return;
   Ostream &Str = Func->getContext()->getStrEmit();
   assert(this->getSrcSize() == 2);
+  assert(isVectorType(this->getSrc(1)->getType()));
   Str << "\tmovups\t";
   this->getSrc(0)->emit(Func);
   Str << ", ";
@@ -2178,7 +2179,8 @@ void InstX86StoreQ<Machine>::emit(const Cfg *Func) const {
   Ostream &Str = Func->getContext()->getStrEmit();
   assert(this->getSrcSize() == 2);
   assert(this->getSrc(1)->getType() == IceType_i64 ||
-         this->getSrc(1)->getType() == IceType_f64);
+         this->getSrc(1)->getType() == IceType_f64 ||
+         isVectorType(this->getSrc(1)->getType()));
   Str << "\tmovq\t";
   this->getSrc(0)->emit(Func);
   Str << ", ";