Revert 8122 (stub call asserts) while test failures are investigated.

src/x64/deoptimizer-x64.cc

Index: src/x64/deoptimizer-x64.cc
===================================================================
--- src/x64/deoptimizer-x64.cc	(revision 8124)
+++ src/x64/deoptimizer-x64.cc	(working copy)
@@ -681,10 +681,7 @@
 
   Isolate* isolate = masm()->isolate();
 
-  {
-    AllowExternalCallThatCantCauseGC scope(masm());
-    __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate), 6);
-  }
+  __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate), 6);
   // Preserve deoptimizer object in register rax and get the input
   // frame descriptor pointer.
   __ movq(rbx, Operand(rax, Deoptimizer::input_offset()));
@@ -730,11 +727,8 @@
   __ PrepareCallCFunction(2);
   __ movq(arg1, rax);
   __ LoadAddress(arg2, ExternalReference::isolate_address());
-  {
-    AllowExternalCallThatCantCauseGC scope(masm());
-    __ CallCFunction(
-        ExternalReference::compute_output_frames_function(isolate), 2);
-  }
+  __ CallCFunction(
+      ExternalReference::compute_output_frames_function(isolate), 2);
   __ pop(rax);
 
   // Replace the current frame with the output frames.