executor: increase input buffer size

I bumped input buffer size on Go side in:
a2af37f0 prog: increase encodingexec buffer size
But I forgot to increase the size on the executor side.
Do this and add comments re keeping them in sync.

1 files changed, 1 insertions, 1 deletions

diff --git a/executor/executor.cc b/executor/executor.cc
index c0e332190..f0d32dcea 100644
--- a/executor/executor.cc
+++ b/executor/executor.cc
@@ -132,8 +132,8 @@ static int flag_fault_nth;
 #define SYZ_EXECUTOR 1
 #include "common.h"
 
+const int kMaxInput = 4 << 20; // keep in sync with prog.ExecBufferSize
 const int kMaxCommands = 1000;
-const int kMaxInput = 2 << 20;
 
 const uint64 instr_eof = -1;
 const uint64 instr_copyin = -2;