Revert "Don't block quick callee saved registers for optimizing."

X64 has one libcore test failing, and codegen_test on
arm is failing.

This reverts commit 6004796d6c630696127df2494dcd4f30d1367a34.

Change-Id: I20e00431fa18e11ce4c0cb6fffa91977fa8e9b4f
diff --git a/compiler/utils/x86/assembler_x86.cc b/compiler/utils/x86/assembler_x86.cc
index 6aec45e..f0353f6 100644
--- a/compiler/utils/x86/assembler_x86.cc
+++ b/compiler/utils/x86/assembler_x86.cc
@@ -269,11 +269,11 @@
 }
 
 
-void X86Assembler::setb(Condition condition, ByteRegister dst) {
+void X86Assembler::setb(Condition condition, Register dst) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x0F);
   EmitUint8(0x90 + condition);
-  EmitRegisterOperand(0, dst);
+  EmitOperand(0, Operand(dst));
 }
 
 
diff --git a/compiler/utils/x86/assembler_x86.h b/compiler/utils/x86/assembler_x86.h
index fe07e8f..9fecf1e 100644
--- a/compiler/utils/x86/assembler_x86.h
+++ b/compiler/utils/x86/assembler_x86.h
@@ -251,7 +251,7 @@
 
   void cmovl(Condition condition, Register dst, Register src);
 
-  void setb(Condition condition, ByteRegister dst);
+  void setb(Condition condition, Register dst);
 
   void movaps(XmmRegister dst, XmmRegister src);
   void movss(XmmRegister dst, const Address& src);
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index 60ab475..51d1de2 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -180,18 +180,18 @@
   void Init(CpuRegister base_in, int32_t disp) {
     if (disp == 0 && base_in.AsRegister() != RBP) {
       SetModRM(0, base_in);
-      if (base_in.LowBits() == RSP) {
+      if (base_in.AsRegister() == RSP) {
         SetSIB(TIMES_1, CpuRegister(RSP), base_in);
       }
     } else if (disp >= -128 && disp <= 127) {
       SetModRM(1, base_in);
-      if (base_in.LowBits() == RSP) {
+      if (base_in.AsRegister() == RSP) {
         SetSIB(TIMES_1, CpuRegister(RSP), base_in);
       }
       SetDisp8(disp);
     } else {
       SetModRM(2, base_in);
-      if (base_in.LowBits() == RSP) {
+      if (base_in.AsRegister() == RSP) {
         SetSIB(TIMES_1, CpuRegister(RSP), base_in);
       }
       SetDisp32(disp);
diff --git a/compiler/utils/x86_64/assembler_x86_64_test.cc b/compiler/utils/x86_64/assembler_x86_64_test.cc
index 0ce809c..c8e923c 100644
--- a/compiler/utils/x86_64/assembler_x86_64_test.cc
+++ b/compiler/utils/x86_64/assembler_x86_64_test.cc
@@ -544,29 +544,6 @@
   DriverStr(expected, "movl");
 }
 
-TEST_F(AssemblerX86_64Test, Movq) {
-  GetAssembler()->movq(x86_64::CpuRegister(x86_64::RAX), x86_64::Address(
-      x86_64::CpuRegister(x86_64::R12), 12));
-  GetAssembler()->movq(x86_64::CpuRegister(x86_64::RAX), x86_64::Address(
-      x86_64::CpuRegister(x86_64::R12), 0));
-  GetAssembler()->movq(x86_64::CpuRegister(x86_64::RAX), x86_64::Address(
-      x86_64::CpuRegister(x86_64::R12), 256));
-  GetAssembler()->movq(x86_64::CpuRegister(x86_64::RAX), x86_64::Address(
-      x86_64::CpuRegister(x86_64::RBP), 12));
-  GetAssembler()->movq(x86_64::CpuRegister(x86_64::RAX), x86_64::Address(
-      x86_64::CpuRegister(x86_64::RBP), 0));
-  GetAssembler()->movq(x86_64::CpuRegister(x86_64::RAX), x86_64::Address(
-      x86_64::CpuRegister(x86_64::RBP), 256));
-  const char* expected =
-    "movq 0xc(%R12), %RAX\n"
-    "movq (%R12), %RAX\n"
-    "movq 0x100(%R12), %RAX\n"
-    "movq 0xc(%RBP), %RAX\n"
-    "movq (%RBP), %RAX\n"
-    "movq 0x100(%RBP), %RAX\n";
-  DriverStr(expected, "movq");
-}
-
 TEST_F(AssemblerX86_64Test, Movw) {
   GetAssembler()->movw(x86_64::Address(x86_64::CpuRegister(x86_64::RAX), 0),
                        x86_64::CpuRegister(x86_64::R9));