Add vzeroupper for processors with AVX

To avoid false dependencies on upper 128 bits of YMM registers.

src/crypto/randomx/jit_compiler_x86_static.asm

@@ -82,6 +82,9 @@ randomx_program_prologue_first_load PROC
 	ror rdx, 32
 	and edx, RANDOMX_SCRATCHPAD_MASK
 	stmxcsr dword ptr [rsp-20]
+	nop
+	nop
+	nop
 	jmp randomx_program_loop_begin
 randomx_program_prologue_first_load ENDP