Subzero: Refactor x86 register definitions to use the alias mechanism.

src/IceAssemblerX8632.h

Index: src/IceAssemblerX8632.h
diff --git a/src/IceAssemblerX8632.h b/src/IceAssemblerX8632.h
index 3672ecde843844faea5b17de8ee90a6d97fd06b3..fb9eedf9a81e0d5255d508cb5f7fead37c4dc0a6 100644
--- a/src/IceAssemblerX8632.h
+++ b/src/IceAssemblerX8632.h
@@ -45,8 +45,8 @@ class AssemblerX8632 : public X86Internal::AssemblerX86Base<TargetX8632> {
   AssemblerX8632 &operator=(const AssemblerX8632 &) = delete;
 
 public:
-  explicit AssemblerX8632(GlobalContext *Ctx, bool use_far_branches = false)
-      : X86Internal::AssemblerX86Base<TargetX8632>(Asm_X8632, Ctx,
+  explicit AssemblerX8632(bool use_far_branches = false)
+      : X86Internal::AssemblerX86Base<TargetX8632>(Asm_X8632,
                                                    use_far_branches) {}
   ~AssemblerX8632() override = default;