Heed spill slot alignment on ARM.

Use the spill slot alignment as well as the local variable alignment to
determine when the stack needs to be realigned. This works now that the
ARM target can always realign the stack by using a base pointer.

Still respect the ARMBaseRegisterInfo::canRealignStack() function
vetoing a realigned stack.  Don't use aligned spill code in that case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146997 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/ARM/fast-isel-deadcode.ll

@@ -15,8 +15,7 @@ entry:
 ; THUMB-NOT: sxtb
 ; THUMB: movs r0, #0
 ; THUMB: movt r0, #0
-; THUMB: add sp, #32
-; THUMb: pop {r7, pc}
+; THUMB: pop
   ret i32 0
 }