Subzero: Refactor x86 register representation to actively use aliases.

src/IceCfgNode.cpp

Index: src/IceCfgNode.cpp
diff --git a/src/IceCfgNode.cpp b/src/IceCfgNode.cpp
index e0628c40a18f403ce3f183373a2f03e49e7e3de2..004a0b34d13dd754d88764455f2c843a67e7aa89 100644
--- a/src/IceCfgNode.cpp
+++ b/src/IceCfgNode.cpp
@@ -304,6 +304,7 @@ class PhiDesc {
   PhiDesc() = delete;
   PhiDesc(const PhiDesc &) = delete;
   PhiDesc &operator=(const PhiDesc &) = delete;
+
 public:
   PhiDesc(InstPhi *Phi, Variable *Dest) : Phi(Phi), Dest(Dest) {}
   PhiDesc(PhiDesc &&) = default;
@@ -457,7 +458,7 @@ void CfgNode::advancedPhiLowering() {
         if (Item2.Processed)
           continue;
         // There shouldn't be two different Phis with the same Dest variable or
-          // register.
+        // register.
         assert((&Item == &Item2) || !sameVarOrReg(Target, Dest, Item2.Dest));
         if (sameVarOrReg(Target, Dest, Item2.Src))
           ++Item.NumPred;