Stop adapting the arguments passed to the builtin implementations...

src/macro-assembler-arm.cc

Index: src/macro-assembler-arm.cc
===================================================================
--- src/macro-assembler-arm.cc	(revision 311)
+++ src/macro-assembler-arm.cc	(working copy)
@@ -299,7 +299,16 @@
       definitely_matches = true;
     } else {
       mov(r0, Operand(actual.immediate()));
-      mov(r2, Operand(expected.immediate()));
+      const int sentinel = SharedFunctionInfo::kDontAdaptArgumentsSentinel;
+      if (expected.immediate() == sentinel) {
+        // Don't worry about adapting arguments for builtins that
+        // don't want that done. Skip adaption code by making it look
+        // like we have a match between expected and actual number of
+        // arguments.
+        definitely_matches = true;
+      } else {
+        mov(r2, Operand(expected.immediate()));
+      }
     }
   } else {
     if (actual.is_immediate()) {