Modify pnacl subzero to be able to read pnacl bitcode files.

tests_lit/llvm2ice_tests/64bit.pnacl.ll

 ; RUIN: %llvm2ice --verbose none %s | FileCheck %s
 ; RUIN: %llvm2ice --verbose none %s | FileCheck --check-prefix=ERRORS %s
-; RUN: %szdiff --llvm2ice=%llvm2ice %s | FileCheck --check-prefix=DUMP %s
+; RUN: %llvm2iceinsts %s | %szdiff %s | FileCheck --check-prefix=DUMP %s
+; RUN: %llvm2iceinsts --pnacl %s | %szdiff %s \
+; RUN:                           | FileCheck --check-prefix=DUMP %s
 
 @__init_array_start = internal constant [0 x i8] zeroinitializer, align 4
 @__fini_array_start = internal constant [0 x i8] zeroinitializer, align 4
 @__tls_template_start = internal constant [0 x i8] zeroinitializer, align 8
 @__tls_template_alignment = internal constant [4 x i8] c"\01\00\00\00", align 4
 
 define internal i32 @ignore64BitArg(i64 %a, i32 %b, i64 %c) {
 entry:
   ret i32 %b
 }
@@ skipping 698 matching lines @@
 }
 ; CHECK: icmpUle64Bool:
 ; CHECK: cmp
 ; CHECK: jb
 ; CHECK: ja
 ; CHECK: cmp
 ; CHECK: jbe
 
 define internal i64 @load64(i32 %a) {
 entry:
-  %a.asptr = inttoptr i32 %a to i64*
-  %v0 = load i64* %a.asptr, align 1
+  %__1 = inttoptr i32 %a to i64*
+  %v0 = load i64* %__1, align 1
   ret i64 %v0
 }
 ; CHECK: load64:
 ; CHECK: mov e[[REGISTER:[a-z]+]], dword ptr [esp+4]
 ; CHECK-NEXT: mov {{.*}}, dword ptr [e[[REGISTER]]]
 ; CHECK-NEXT: mov {{.*}}, dword ptr [e[[REGISTER]]+4]
 
 define internal void @store64(i32 %a, i64 %value) {
 entry:
-  %a.asptr = inttoptr i32 %a to i64*
-  store i64 %value, i64* %a.asptr, align 1
+  %__2 = inttoptr i32 %a to i64*
+  store i64 %value, i64* %__2, align 1
   ret void
 }
 ; CHECK: store64:
 ; CHECK: mov e[[REGISTER:[a-z]+]], dword ptr [esp+4]
 ; CHECK: mov dword ptr [e[[REGISTER]]+4],
 ; CHECK: mov dword ptr [e[[REGISTER]]],
 
 define internal void @store64Const(i32 %a) {
 entry:
   %a.asptr = inttoptr i32 %a to i64*
@@ skipping 45 matching lines @@
 ; CHECK: cmp
 ; CHECK: jb
 ; CHECK: ja
 ; CHECK: cmp
 ; CHECK: jb
 ; CHECK: cmp
 ; CHECK: jne
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ