WIP: wasm oob trap handling experiments

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index b2154fbaf4a61a7198481747f82b6f1a50ceae84..d98e7371d11523ae5441aeee39ca1adbe5844a96 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1852,6 +1852,9 @@ class Assembler : public AssemblerBase {
   byte byte_at(int pos)  { return buffer_[pos]; }
   void set_byte_at(int pos, byte value) { buffer_[pos] = value; }
 
+  Address GetPC() const { return pc_; }
+  void RecordRelocInfo(RelocInfo* rinfo);
+
  protected:
   // Call near indirect
   void call(const Operand& operand);