PPC: Remove receiver conversion from function prologue

Port 4ab1b05d

Original commit message:
    Depends on https://codereview.chromium.org/1407373007/
    After that CL, all receiver conversion is handled by the call builtin.

R=verwaest@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com, dstence@us.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1412803014

Cr-Commit-Position: refs/heads/master@{#31902}

src/crankshaft/ppc/lithium-codegen-ppc.cc

@@ -117,24 +117,6 @@ bool LCodeGen::GeneratePrologue() {
     // fp: Caller's frame pointer.
     // lr: Caller's pc.
     // ip: Our own function entry (required by the prologue)
-
-    // Sloppy mode functions and builtins need to replace the receiver with the
-    // global proxy when called as functions (without an explicit receiver
-    // object).
-    if (info()->MustReplaceUndefinedReceiverWithGlobalProxy()) {
-      Label ok;
-      int receiver_offset = info_->scope()->num_parameters() * kPointerSize;
-      __ LoadP(r5, MemOperand(sp, receiver_offset));
-      __ CompareRoot(r5, Heap::kUndefinedValueRootIndex);
-      __ bne(&ok);
-
-      __ LoadP(r5, GlobalObjectOperand());
-      __ LoadP(r5, FieldMemOperand(r5, JSGlobalObject::kGlobalProxyOffset));
-
-      __ StoreP(r5, MemOperand(sp, receiver_offset));
-
-      __ bind(&ok);
-    }
   }
 
   int prologue_offset = masm_->pc_offset();

src/full-codegen/ppc/full-codegen-ppc.cc

@@ -113,22 +113,12 @@ void FullCodeGenerator::Generate() {
   }
 #endif
 
-  // Sloppy mode functions and builtins need to replace the receiver with the
-  // global proxy when called as functions (without an explicit receiver
-  // object).
-  if (info->MustReplaceUndefinedReceiverWithGlobalProxy()) {
-    Label ok;
+  if (FLAG_debug_code && info->ExpectsJSReceiverAsReceiver()) {
     int receiver_offset = info->scope()->num_parameters() * kPointerSize;
     __ LoadP(r5, MemOperand(sp, receiver_offset), r0);
-    __ CompareRoot(r5, Heap::kUndefinedValueRootIndex);
-    __ bne(&ok);
-
-    __ LoadP(r5, GlobalObjectOperand());
-    __ LoadP(r5, FieldMemOperand(r5, JSGlobalObject::kGlobalProxyOffset));
-
-    __ StoreP(r5, MemOperand(sp, receiver_offset), r0);
-
-    __ bind(&ok);
+    __ AssertNotSmi(r5);
+    __ CompareObjectType(r5, r5, no_reg, FIRST_SPEC_OBJECT_TYPE);
+    __ Assert(ge, kSloppyFunctionExpectsJSReceiverReceiver);
   }
 
   // Open a frame scope to indicate that there is a frame on the stack.  The