Subzero: Update tests and build scripts for sandboxing.

tests_lit/assembler/x86/sandboxing.ll

 ; Tests basics and corner cases of x86-32 sandboxing, using -Om1 in
 ; the hope that the output will remain stable.  When packing bundles,
 ; we try to limit to a few instructions with well known sizes and
 ; minimal use of registers and stack slots in the lowering sequence.
 
 ; RUN: %p2i -i %s --assemble --disassemble --args -Om1 --verbose none \
 ; RUN:   -ffunction-sections -sandbox | FileCheck %s
 
 declare void @call_target()
 @global_byte = internal global [1 x i8] zeroinitializer
@@ skipping 212 matching lines @@
 ; CHECK-LABEL: bundle_lock_align_to_end_padding_2
 ; CHECK: call
 ; CHECK-NEXT: 20: {{.*}} mov BYTE PTR
 ; CHECK-NEXT: 27: {{.*}} mov WORD PTR
 ; CHECK-NEXT: 30: {{.*}} mov WORD PTR
 ; CHECK-NEXT: 39: {{.*}} mov [[REG:.*]],DWORD PTR [esp
 ; CHECK-NEXT: 3d: {{.*}} nop
 ; CHECK: 40: {{.*}} nop
 ; CHECK: 5b: {{.*}} and [[REG]],0xffffffe0
 ; CHECK-NEXT: 5e: {{.*}} call [[REG]]
+
+; Stack adjustment state during an argument push sequence gets
+; properly checkpointed and restored during the two passes, as
+; observed by the stack adjustment for accessing stack-allocated
+; variables.
+define void @checkpoint_restore_stack_adjustment(i32 %arg) {
+entry:
+  call void @call_target()
+  ; bundle boundary
+  call void @checkpoint_restore_stack_adjustment(i32 %arg)
+  ret void
+}
+; CHECK-LABEL: checkpoint_restore_stack_adjustment
+; CHECK: call
+; CHECK: sub esp,0x10
+; The address of %arg should be [esp+0x20], not [esp+0x30].
+; CHECK-NEXT: mov [[REG:.*]],DWORD PTR [esp+0x20]
+; CHECK-NEXT: mov DWORD PTR [esp],[[REG]]
+; CHECK: call
+; CHECK: add esp,0x10