X64: Change kSmiConstantRegister to r12.

test/cctest/test-assembler-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 32 matching lines @@
 using v8::internal::Label;
 using v8::internal::rax;
 using v8::internal::rsi;
 using v8::internal::rdi;
 using v8::internal::rcx;
 using v8::internal::rdx;
 using v8::internal::rbp;
 using v8::internal::rsp;
 using v8::internal::r8;
 using v8::internal::r9;
-using v8::internal::r12;
 using v8::internal::r13;
+using v8::internal::r15;
 using v8::internal::times_1;
 
 using v8::internal::FUNCTION_CAST;
 using v8::internal::CodeDesc;
 using v8::internal::less_equal;
 using v8::internal::not_equal;
 using v8::internal::greater;
 
 // Test the x64 assembler by compiling some simple functions into
 // a buffer and executing them.  These tests do not initialize the
@@ skipping 245 matching lines @@
 
     CHECK(Operand(rax, rcx, times_1, offset).AddressUsesRegister(rax));
     CHECK(Operand(rax, rcx, times_1, offset).AddressUsesRegister(rcx));
     CHECK(!Operand(rax, rcx, times_1, offset).AddressUsesRegister(r8));
     CHECK(!Operand(rax, rcx, times_1, offset).AddressUsesRegister(r9));
     CHECK(!Operand(rax, rcx, times_1, offset).AddressUsesRegister(rdx));
     CHECK(!Operand(rax, rcx, times_1, offset).AddressUsesRegister(rsp));
 
     CHECK(Operand(rsp, offset).AddressUsesRegister(rsp));
     CHECK(!Operand(rsp, offset).AddressUsesRegister(rax));
-    CHECK(!Operand(rsp, offset).AddressUsesRegister(r12));
+    CHECK(!Operand(rsp, offset).AddressUsesRegister(r15));
 
     CHECK(Operand(rbp, offset).AddressUsesRegister(rbp));
     CHECK(!Operand(rbp, offset).AddressUsesRegister(rax));
     CHECK(!Operand(rbp, offset).AddressUsesRegister(r13));
 
     CHECK(Operand(rbp, rax, times_1, offset).AddressUsesRegister(rbp));
     CHECK(Operand(rbp, rax, times_1, offset).AddressUsesRegister(rax));
     CHECK(!Operand(rbp, rax, times_1, offset).AddressUsesRegister(rcx));
     CHECK(!Operand(rbp, rax, times_1, offset).AddressUsesRegister(r13));
     CHECK(!Operand(rbp, rax, times_1, offset).AddressUsesRegister(r8));
     CHECK(!Operand(rbp, rax, times_1, offset).AddressUsesRegister(rsp));
 
     CHECK(Operand(rsp, rbp, times_1, offset).AddressUsesRegister(rsp));
     CHECK(Operand(rsp, rbp, times_1, offset).AddressUsesRegister(rbp));
     CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(rax));
-    CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(r12));
+    CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(r15));
     CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(r13));
   }
 }
 
 #undef __