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

src/IceAssembler.cpp

Index: src/IceAssembler.cpp
diff --git a/src/IceAssembler.cpp b/src/IceAssembler.cpp
index 747ae584fd25051f61c6647c4e2dc2360f2073d1..aed8763926d1286304f54f776361f930f53a02e5 100644
--- a/src/IceAssembler.cpp
+++ b/src/IceAssembler.cpp
@@ -133,7 +133,7 @@ llvm::StringRef Assembler::getBufferView() const {
                          Buffer.size());
 }
 
-void Assembler::emitIASBytes() const {
+void Assembler::emitIASBytes(GlobalContext *Ctx) const {
   Ostream &Str = Ctx->getStrEmit();
   intptr_t EndPosition = Buffer.size();
   intptr_t CurPosition = 0;