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

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index 8a0d3be69b11771a58284b3659680ac778465fb9..58268495fed619deb2194ecbcfed7be246a0e270 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -227,6 +227,9 @@ class LCodeGen V8_FINAL BASE_EMBEDDED {
   bool GenerateDeoptJumpTable();
   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