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

src/IceAssemblerMIPS32.h

Index: src/IceAssemblerMIPS32.h
diff --git a/src/IceAssemblerMIPS32.h b/src/IceAssemblerMIPS32.h
index 9f6ba426743fe62180232dcc4fd86b4ee079719f..9af1151d144b675c55cd44aeefeb4c9d79094aa1 100644
--- a/src/IceAssemblerMIPS32.h
+++ b/src/IceAssemblerMIPS32.h
@@ -35,8 +35,8 @@ class AssemblerMIPS32 : public Assembler {
   AssemblerMIPS32 &operator=(const AssemblerMIPS32 &) = delete;
 
 public:
-  explicit AssemblerMIPS32(GlobalContext *Ctx, bool use_far_branches = false)
-      : Assembler(Asm_MIPS32, Ctx) {
+  explicit AssemblerMIPS32(bool use_far_branches = false)
+      : Assembler(Asm_MIPS32) {
     // This mode is only needed and implemented for MIPS32 and ARM.
     assert(!use_far_branches);
     (void)use_far_branches;