Added few more SIMD extensions for x86/x86_64 (SSE).

Rationale:
Prototype ART vectorizer needs way to set invariant vectors.

Test: assembler_x86[_64]_test
Bug: 34083438
Change-Id: I5ab2ad77b8f9b64b46cc8635ad926e54787508a2
diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index d3b15ac..a24d49e 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -1057,6 +1057,25 @@
 }
 
 
+void X86Assembler::shufpd(XmmRegister dst, XmmRegister src, const Immediate& imm) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
+  EmitUint8(0x0F);
+  EmitUint8(0xC6);
+  EmitXmmRegisterOperand(dst, src);
+  EmitUint8(imm.value());
+}
+
+
+void X86Assembler::shufps(XmmRegister dst, XmmRegister src, const Immediate& imm) {
+  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x0F);
+  EmitUint8(0xC6);
+  EmitXmmRegisterOperand(dst, src);
+  EmitUint8(imm.value());
+}
+
+
 void X86Assembler::fldl(const Address& src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0xDD);