Add support for passing and returning vectors in accordance with the x86 calling convention.

src/IceInstX8632.h

Index: src/IceInstX8632.h
diff --git a/src/IceInstX8632.h b/src/IceInstX8632.h
index 0e4964fd4f31b2eb1e1e00034c871da178622fd8..e3dc764071d93282505b3db81f972ac9729c9bb5 100644
--- a/src/IceInstX8632.h
+++ b/src/IceInstX8632.h
@@ -171,6 +171,7 @@ public:
     Shr,
     Shrd,
     Store,
+    Storep,
     StoreQ,
     Sub,
     Subss,
@@ -622,6 +623,24 @@ private:
   virtual ~InstX8632Store() {}
 };
 
+// Store packed - wrapper for storing vectors
+class InstX8632Storep : public InstX8632 {
+public:
+  static InstX8632Storep *create(Cfg *Func, Operand *Value, OperandX8632 *Mem) {
+    return new (Func->allocate<InstX8632Storep>())
+        InstX8632Storep(Func, Value, Mem);
+  }
+  virtual void emit(const Cfg *Func) const;
+  virtual void dump(const Cfg *Func) const;
+  static bool classof(const Inst *Inst) { return isClassof(Inst, Storep); }
+
+private:
+  InstX8632Storep(Cfg *Func, Operand *Value, OperandX8632 *Mem);
+  InstX8632Storep(const InstX8632Storep &) LLVM_DELETED_FUNCTION;
+  InstX8632Storep &operator=(const InstX8632Storep &) LLVM_DELETED_FUNCTION;
+  virtual ~InstX8632Storep() {}
+};
+
 // Move/assignment instruction - wrapper for mov/movss/movsd.
 class InstX8632Mov : public InstX8632 {
 public: