Reland of [ignition/turbo] Perform liveness analysis on the bytecodes

src/interpreter/bytecode-label.h

Index: src/interpreter/bytecode-label.h
diff --git a/src/interpreter/bytecode-label.h b/src/interpreter/bytecode-label.h
index b5f602d21651a16bf0186f37a8543dd99267136d..4ef6265eb29c0a82a8d4020c7303837fedcfdd99 100644
--- a/src/interpreter/bytecode-label.h
+++ b/src/interpreter/bytecode-label.h
@@ -17,7 +17,7 @@ class BytecodeArrayBuilder;
 // label is bound, it represents a known position in the bytecode
 // array. For labels that are forward references there can be at most
 // one reference whilst it is unbound.
-class BytecodeLabel final {
+class V8_EXPORT_PRIVATE BytecodeLabel final {
  public:
   BytecodeLabel() : bound_(false), offset_(kInvalidOffset) {}
 
@@ -54,7 +54,7 @@ class BytecodeLabel final {
 };
 
 // Class representing a branch target of multiple jumps.
-class BytecodeLabels {
+class V8_EXPORT_PRIVATE BytecodeLabels {
  public:
   explicit BytecodeLabels(Zone* zone) : labels_(zone) {}