Use smartalign for long nops with NASM

'CPU amdnop' is supported by YASM only.

Change-Id: Ia3f7c2ba6d3bdf2889b62f5c6127fd515d7c7394

third_party/x86inc/x86inc.asm

@@ -114,7 +114,12 @@
 %endif
 
 ; Always use long nops (reduces 0x90 spam in disassembly on x86_32)
+%ifndef __NASM_VER__
 CPU amdnop
+%else
+%use smartalign
+ALIGNMODE k7
+%endif
 
 ; Macros to eliminate most code duplication between x86_32 and x86_64:
 ; Currently this works only for leaf functions which load all their arguments