VM: Enable collection of unoptimized code for optimized functions.

runtime/vm/code_patcher.cc

Index: runtime/vm/code_patcher.cc
===================================================================
--- runtime/vm/code_patcher.cc	(revision 44996)
+++ runtime/vm/code_patcher.cc	(working copy)
@@ -52,6 +52,7 @@
 // The patch code buffer contains the jmp code which will be inserted at
 // entry point.
 void CodePatcher::PatchEntry(const Code& code) {
+  ASSERT(!IsEntryPatched(code));
   const uword patch_addr = code.GetEntryPatchPc();
   ASSERT(patch_addr != 0);
   JumpPattern jmp_entry(patch_addr, code);
@@ -76,6 +77,7 @@
 // The entry point is a jmp instruction, the patch code buffer contains
 // original code, the entry point contains the jump instruction.
 void CodePatcher::RestoreEntry(const Code& code) {
+  if (!IsEntryPatched(code)) return;
   const uword patch_addr = code.GetEntryPatchPc();
   ASSERT(patch_addr != 0);
   JumpPattern jmp_entry(patch_addr, code);