Keep two empty lines between declarations for cpp files

src/x64/disasm-x64.cc

Index: src/x64/disasm-x64.cc
===================================================================
--- src/x64/disasm-x64.cc	(revision 15486)
+++ src/x64/disasm-x64.cc	(working copy)
@@ -49,6 +49,7 @@
   BYTE_OPER_REG_OP_ORDER = OPER_REG_OP_ORDER | BYTE_SIZE_OPERAND_FLAG
 };
 
+
 //------------------------------------------------------------------
 // Tables
 //------------------------------------------------------------------
@@ -293,6 +294,7 @@
   {"cmovg", TWO_OPERANDS_INSTR, REG_OPER_OP_ORDER, false}
 };
 
+
 //------------------------------------------------------------------------------
 // DisassemblerX64 implementation.
 
@@ -301,6 +303,7 @@
   ABORT_ON_UNIMPLEMENTED_OPCODE
 };
 
+
 // A new DisassemblerX64 object is created to disassemble each instruction.
 // The object can only disassemble a single instruction.
 class DisassemblerX64 {
@@ -1763,6 +1766,7 @@
   return instr_len;
 }
 
+
 //------------------------------------------------------------------------------
 
 
@@ -1822,6 +1826,7 @@
   return "";
 }
 
+
 //------------------------------------------------------------------------------
 
 Disassembler::Disassembler(const NameConverter& converter)