x86: compact supposedly unused entry point code 

No point in aligning entry points which aren't supposed to be used
anyway.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
TBD: Might consider simply using "andq $-15,%rsp", delivering an
uninitialized error code (which shouldn't matter).

--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -866,11 +866,11 @@ autogen_stubs: /* Automatically generate
 
         vec = 0
         .rept NR_VECTORS
-        ALIGN
 
         /* Common interrupts, heading towards do_IRQ(). */
         .if vec >= FIRST_DYNAMIC_VECTOR && vec != HYPERCALL_VECTOR && vec != LEGACY_SYSCALL_VECTOR
 
+        ALIGN
 1:      pushq $0
         movb  $vec,4(%rsp)
         jmp   common_interrupt