Convert a few lit tests that use "lc2i | llvm-mc | llvm-objdump" to use p2i.

tests_lit/llvm2ice_tests/ebp_args.ll

 ; This test originally exhibited a bug in ebp-based stack slots.  The
 ; problem was that during a function call push sequence, the esp
 ; adjustment was incorrectly added to the stack/frame offset for
 ; ebp-based frames.
 
-; TODO(kschimpf) Find out why lc2i is needed.
-; REQUIRES: allow_llvm_ir_as_input
-; RUN: %lc2i -i %s --args -Om1 --target=x8632 --verbose none \
+; RUN: %p2i -i %s --args -Om1 --target=x8632 --verbose none \
 ; RUN:   | llvm-mc -triple=i686-none-nacl -filetype=obj \
 ; RUN:   | llvm-objdump -d --symbolize -x86-asm-syntax=intel - | FileCheck %s
 
 declare i32 @memcpy_helper2(i32 %buf, i32 %buf2, i32 %n)
 
 define i32 @memcpy_helper(i32 %buf, i32 %n) {
 entry:
+  %buf2 = alloca i8, i32 128, align 4
   %n.arg_trunc = trunc i32 %n to i8
-  %buf2 = alloca i8, i32 128, align 4
+  %arg_ext = zext i8 %n.arg_trunc to i32
   %buf2.asint = ptrtoint i8* %buf2 to i32
-  %arg_ext = zext i8 %n.arg_trunc to i32
   %call = call i32 @memcpy_helper2(i32 %buf, i32 %buf2.asint, i32 %arg_ext)
   ret i32 %call
 }
 
 ; This check sequence is highly specific to the current Om1 lowering
 ; and stack slot assignment code, and may need to be relaxed if the
 ; lowering code changes.
 
 ; CHECK-LABEL: memcpy_helper:
 ; CHECK:  push  ebp
 ; CHECK:  mov   ebp, esp
 ; CHECK:  sub   esp, 24
+; CHECK:  sub   esp, 128
+; CHECK:  mov   dword ptr [ebp - 4], esp
 ; CHECK:  mov   eax, dword ptr [ebp + 12]
-; CHECK:  mov   dword ptr [ebp - 4], eax
-; CHECK:  sub   esp, 128
-; CHECK:  mov   dword ptr [ebp - 8], esp
-; CHECK:  mov   eax, dword ptr [ebp - 8]
+; CHECK:  mov   dword ptr [ebp - 8], eax
+; CHECK:  movzx eax, byte ptr [ebp - 8]
 ; CHECK:  mov   dword ptr [ebp - 12], eax
-; CHECK:  movzx eax, byte ptr [ebp - 4]
-; CHECK:  mov   dword ptr [ebp - 16], eax
 ; CHECK:  sub   esp, 16
 ; CHECK:  mov   eax, dword ptr [ebp + 8]
 ; CHECK:  mov   dword ptr [esp], eax
+; CHECK:  mov   eax, dword ptr [ebp - 4]
+; CHECK:  mov   dword ptr [esp + 4], eax
 ; CHECK:  mov   eax, dword ptr [ebp - 12]
-; CHECK:  mov   dword ptr [esp + 4], eax
-; CHECK:  mov   eax, dword ptr [ebp - 16]
 ; CHECK:  mov   dword ptr [esp + 8], eax
 ; CHECK:  call  memcpy_helper2