X87: [compiler] Sanitize entry points to LookupSlot access.

  port 4ff159bd(r33880)

  original commit message:
  Add dedicated %LoadLookupSlot, %LoadLookupSlotInsideTypeof,
  %LoadLookupSlotForCall, %StoreLookupSlot_Sloppy and
  %StoreLookupSlot_Strict runtime entry points and use them
  appropriately in the various compilers. This way we can
  finally drop the machine operators from the JS graph level
  completely in TurboFan.

  Also drop the funky JSLoadDynamic operator from TurboFan,
  which was by now just a small wrapper around the runtime
  call to %LoadLookupSlot.

BUG=

Review URL: https://codereview.chromium.org/1694343002

Cr-Commit-Position: refs/heads/master@{#34012}

src/full-codegen/x87/full-codegen-x87.cc

@@ -1346,7 +1346,8 @@ void FullCodeGenerator::EmitVariableLoad(VariableProxy* proxy,
       // Generate code for loading from variables potentially shadowed
       // by eval-introduced variables.
       EmitDynamicLookupFastCase(proxy, typeof_mode, &slow, &done);
-      __ Push(var->name());
+      __ bind(&slow);
+      __ push(Immediate(var->name()));
       Runtime::FunctionId function_id =
           typeof_mode == NOT_INSIDE_TYPEOF
               ? Runtime::kLoadLookupSlot
@@ -2339,7 +2340,7 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op,
              (var->mode() == CONST && op == Token::INIT)) {
     if (var->IsLookupSlot()) {
       // Assignment to var.
-      __ Push(var->name());
+      __ Push(Immediate(var->name()));
       __ Push(eax);
       __ CallRuntime(is_strict(language_mode())
                          ? Runtime::kStoreLookupSlot_Strict