[turbofan] Assume deoptimization support in create lowering.

This simplfies the code for lowering of {JSCreateArguments} nodes under
the assumption that deoptimization support is always enabled, and that
arguments objects are only materialized for JavaScript frames and not
for internal stub frames.

R=tebbi@chromium.org

Change-Id: I5f86ae0f0442a03b516904d737c5a0eac293b5b9
Reviewed-on: https://chromium-review.googlesource.com/640381Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47685}

src/builtins/builtins-arguments-gen.cc

@@ -206,12 +206,6 @@ Node* ArgumentsBuiltinsAssembler::EmitFastNewRestParameter(Node* context,
   return result.value();
 }
 
-TF_BUILTIN(FastNewRestParameter, ArgumentsBuiltinsAssembler) {
-  Node* function = Parameter(Descriptor::kFunction);
-  Node* context = Parameter(Descriptor::kContext);
-  Return(EmitFastNewRestParameter(context, function));
-}
-
 Node* ArgumentsBuiltinsAssembler::EmitFastNewStrictArguments(Node* context,
                                                              Node* function) {
   VARIABLE(result, MachineRepresentation::kTagged);
@@ -262,12 +256,6 @@ Node* ArgumentsBuiltinsAssembler::EmitFastNewStrictArguments(Node* context,
   return result.value();
 }
 
-TF_BUILTIN(FastNewStrictArguments, ArgumentsBuiltinsAssembler) {
-  Node* function = Parameter(FastNewArgumentsDescriptor::kFunction);
-  Node* context = Parameter(FastNewArgumentsDescriptor::kContext);
-  Return(EmitFastNewStrictArguments(context, function));
-}
-
 Node* ArgumentsBuiltinsAssembler::EmitFastNewSloppyArguments(Node* context,
                                                              Node* function) {
   Node* frame_ptr;

src/builtins/builtins-definitions.h

@@ -73,9 +73,7 @@ namespace internal {
   TFC(FastNewClosure, FastNewClosure, 1)                                       \
   TFC(FastNewFunctionContextEval, FastNewFunctionContext, 1)                   \
   TFC(FastNewFunctionContextFunction, FastNewFunctionContext, 1)               \
-  TFC(FastNewStrictArguments, FastNewArguments, 1)                             \
   TFC(FastNewSloppyArguments, FastNewArguments, 1)                             \
-  TFC(FastNewRestParameter, FastNewArguments, 1)                               \
   TFC(FastCloneRegExp, FastCloneRegExp, 1)                                     \
   TFC(FastCloneShallowArrayTrack, FastCloneShallowArray, 1)                    \
   TFC(FastCloneShallowArrayDontTrack, FastCloneShallowArray, 1)                \