X64: Fix error in division & modulus, adjust mjsunit test status, fix lint er...

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
===================================================================
--- src/x64/assembler-x64.h	(revision 2580)
+++ src/x64/assembler-x64.h	(working copy)
@@ -632,9 +632,13 @@
 
   // Sign-extends rax into rdx:rax.
   void cqo();
+  // Sign-extends eax into edx:eax.
+  void cdq();
 
   // Divide rdx:rax by src.  Quotient in rax, remainder in rdx.
-  void idiv(Register src);
+  void idivq(Register src);
+  // Divide edx:eax by lower 32 bits of src.  Quotient in eax, rem. in edx.
+  void idivl(Register src);
 
   // Signed multiply instructions.
   void imul(Register src);                               // rdx:rax = rax * src.