Re-reland: Remove register index/code indirection

src/assembler.cc

Index: src/assembler.cc
diff --git a/src/assembler.cc b/src/assembler.cc
index aabc64ba5c71ba8ef6f5bcc1c991666c787d6ab7..fcfd1ebbd161c78482e5704fbf7a7dae4ddb5a2b 100644
--- a/src/assembler.cc
+++ b/src/assembler.cc
@@ -53,6 +53,7 @@
 #include "src/regexp/jsregexp.h"
 #include "src/regexp/regexp-macro-assembler.h"
 #include "src/regexp/regexp-stack.h"
+#include "src/register-configuration.h"
 #include "src/runtime/runtime.h"
 #include "src/snapshot/serialize.h"
 #include "src/token.h"
@@ -104,6 +105,37 @@ namespace v8 {
 namespace internal {
 
 // -----------------------------------------------------------------------------
+// Common register code.
+
+const char* Register::ToString() {
+  // This is the mapping of allocation indices to registers.
+  DCHECK(reg_code >= 0 && reg_code < kNumRegisters);
+  return RegisterConfiguration::ArchDefault()->GetGeneralRegisterName(reg_code);
+}
+
+
+bool Register::IsAllocatable() const {
+  return ((1 << reg_code) &
+          RegisterConfiguration::ArchDefault()
+              ->allocatable_general_codes_mask()) != 0;
+}
+
+
+const char* DoubleRegister::ToString() {
+  // This is the mapping of allocation indices to registers.
+  DCHECK(reg_code >= 0 && reg_code < kMaxNumRegisters);
+  return RegisterConfiguration::ArchDefault()->GetDoubleRegisterName(reg_code);
+}
+
+
+bool DoubleRegister::IsAllocatable() const {
+  return ((1 << reg_code) &
+          RegisterConfiguration::ArchDefault()
+              ->allocatable_double_codes_mask()) != 0;
+}
+
+
+// -----------------------------------------------------------------------------
 // Common double constants.
 
 struct DoubleConstant BASE_EMBEDDED {