Generate a custom OSR entrypoint for OSR compiles on all platforms, and transition to optimized cod…

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 23b2e48fb0c5c403ecec0cb60a6143d1151212fa..f684b6d29d36d4c4b1ec5826981f2379518470c5 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -233,6 +233,9 @@ class LCodeGen V8_FINAL BASE_EMBEDDED {
   bool GenerateJumpTable();
   bool GenerateSafepointTable();
 
+  // Generates the custom OSR entrypoint and sets the osr_pc_offset.
+  void GenerateOsrPrologue();
+
   enum SafepointMode {
     RECORD_SIMPLE_SAFEPOINT,
     RECORD_SAFEPOINT_WITH_REGISTERS_AND_NO_ARGUMENTS