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

tests_lit/llvm2ice_tests/phi.ll

 ; This tests some of the subtleties of Phi lowering.  In particular,
 ; it tests that it does the right thing when it tries to enable
 ; compare/branch fusing.
 
-; TODO(kschimpf) Find out why lc2i must be used.
-; REQUIRES: allow_llvm_ir_as_input
-; RUN: %lc2i -i %s --args -O2 --verbose none --phi-edge-split=0 \
+; RUN: %p2i -i %s --args -O2 --verbose none --phi-edge-split=0 \
 ; RUN:   | llvm-mc -triple=i686-none-nacl -filetype=obj \
 ; RUN:   | llvm-objdump -d -symbolize -x86-asm-syntax=intel - | FileCheck %s
 
 define internal i32 @testPhi1(i32 %arg) {
 entry:
   %cmp1 = icmp sgt i32 %arg, 0
   br i1 %cmp1, label %next, label %target
 next:
   br label %target
 target:
@@ skipping 33 matching lines @@
 ; CHECK: mov {{.*}}, [[PHI]]
 
 ; Test that address mode inference doesn't extend past
 ; multi-definition, non-SSA Phi temporaries.
 define internal i32 @testPhi3(i32 %arg) {
 entry:
   br label %body
 body:
   %merge = phi i32 [ %arg, %entry ], [ %elt, %body ]
   %interior = add i32 %merge, 1000
-  %__4 = inttoptr i32 %interior to i32*
+  ; Trick to make a basic block local copy of interior for
+  ; addressing mode optimization.
+  %interior__4 = add i32 %interior, 0
+  %__4 = inttoptr i32 %interior__4 to i32*
   %elt = load i32* %__4, align 1
   %cmp = icmp eq i32 %elt, 0
   br i1 %cmp, label %exit, label %body
 exit:
-  %__6 = inttoptr i32 %interior to i32*
+  ; Same trick (making a basic block local copy).
+  %interior__6 = add i32 %interior, 0
+  %__6 = inttoptr i32 %interior__6 to i32*
   store i32 %arg, i32* %__6, align 1
   ret i32 %arg
 }
 ; I can't figure out how to reliably test this for correctness, so I
 ; will just include patterns for the entire current O2 sequence.  This
 ; may need to be changed when meaningful optimizations are added.
 ; The key is to avoid the "bad" pattern like this:
 ;
 ; testPhi3:
 ; .LtestPhi3$entry:
 ;         mov     eax, dword ptr [esp+4]
 ;         mov     ecx, eax
 ; .LtestPhi3$body:
 ;         mov     ecx, dword ptr [ecx+1000]
 ;         cmp     ecx, 0
 ;         jne     .LtestPhi3$body
 ; .LtestPhi3$exit:
 ;         mov     dword ptr [ecx+1000], eax
 ;         ret
 ;
 ; This is bad because the final store address is supposed to be the
 ; same as the load address in the loop, but it has clearly been
 ; over-optimized into a null pointer dereference.
 
 ; CHECK-LABEL: testPhi3
 ; CHECK: push [[EBX:.*]]
 ; CHECK: mov {{.*}}, dword ptr [esp
 ; CHECK: mov
-; CHECK: mov {{.*}}[[ADDR:.*1000]]
+; CHECK: mov {{.*}}, dword ptr [[ADDR:.*1000]]
 ; CHECK: cmp {{.*}}, 0
 ; CHECK: jne
-; CHECK: mov {{.*}}[[ADDR]]
+; CHECK: mov dword ptr [[ADDR]]
 ; CHECK: pop [[EBX]]