Revert "Revert "Better support for x86 XMM registers""

This reverts commit 8ff67e3338952c70ccf3b609559bf8cc0f379cfd.

Fix applied to loc.fp usage.

Change-Id: I1eb3005392544fcf30c595923ed25bcee2dc4859
diff --git a/compiler/dex/vreg_analysis.cc b/compiler/dex/vreg_analysis.cc
index bef966c..f211e3f 100644
--- a/compiler/dex/vreg_analysis.cc
+++ b/compiler/dex/vreg_analysis.cc
@@ -405,7 +405,7 @@
 }
 
 static const RegLocation fresh_loc = {kLocDalvikFrame, 0, 0, 0, 0, 0, 0, 0, 0,
-                                     INVALID_REG, INVALID_REG, INVALID_SREG,
+                                     kVectorNotUsed, INVALID_REG, INVALID_REG, INVALID_SREG,
                                      INVALID_SREG};
 
 void MIRGraph::InitRegLocations() {