X64: Added inline keyed load/store and a bunch of other missing functions.

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index f511145e3bb7cf141ef7a27edb6cac6c45cd7a48..8466109ea8b989d66955110224a3b08fb20b31fc 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -1124,6 +1124,9 @@ void Assembler::movq(const Operand& dst, Register src) {
 
 
 void Assembler::movq(Register dst, void* value, RelocInfo::Mode rmode) {
+  // This method must not be used with heap object references. The stored
+  // address is not GC safe. Use the handle version instead.
+  ASSERT(rmode > RelocInfo::LAST_GCED_ENUM);
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
   emit_rex_64(dst);