Extract platform independent part of RevertStackCheckCode.

src/deoptimizer.cc

Index: src/deoptimizer.cc
diff --git a/src/deoptimizer.cc b/src/deoptimizer.cc
index e6742fe01be43f14f59193bd64671aa62981b428..f081576aa884e7d2b025c1ef5887a686751c9c9d 100644
--- a/src/deoptimizer.cc
+++ b/src/deoptimizer.cc
@@ -823,7 +823,26 @@ void Deoptimizer::PatchStackCheckCode(Code* unoptimized_code,
   for (uint32_t i = 0; i < table_length; ++i) {
     uint32_t pc_offset = Memory::uint32_at(stack_check_cursor + kIntSize);
     Address pc_after = unoptimized_code->instruction_start() + pc_offset;
-    PatchStackCheckAt(pc_after, check_code, replacement_code);
+    PatchStackCheckCodeAt(pc_after, check_code, replacement_code);
+    stack_check_cursor += 2 * kIntSize;
+  }
+}
+
+
+void Deoptimizer::RevertStackCheckCode(Code* unoptimized_code,
+                                       Code* check_code,
+                                       Code* replacement_code) {
+  // Iterate over the stack check table and revert the patched
+  // stack check calls.
+  ASSERT(unoptimized_code->kind() == Code::FUNCTION);
+  Address stack_check_cursor = unoptimized_code->instruction_start() +
+      unoptimized_code->stack_check_table_start();
+  uint32_t table_length = Memory::uint32_at(stack_check_cursor);
+  stack_check_cursor += kIntSize;
+  for (uint32_t i = 0; i < table_length; ++i) {
+    uint32_t pc_offset = Memory::uint32_at(stack_check_cursor + kIntSize);
+    Address pc_after = unoptimized_code->instruction_start() + pc_offset;
+    RevertStackCheckCodeAt(pc_after, check_code, replacement_code);
     stack_check_cursor += 2 * kIntSize;
   }
 }