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

tests_lit/llvm2ice_tests/struct-arith.pnacl.ll

 ; RUIN: %llvm2ice -verbose inst %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
 
 ; This file is lowered from C code that does some simple aritmetic with
 ; struct members. It's also built with the PNaCl toolchain so this is the
 ; stable ABI subset of LLVM IR (structs are gone, pointers turned into i32,
 ; geps gone, etc.)
 
 define internal i32 @compute_important_function(i32 %v1, i32 %v2) {
 entry:
-  %v1.asptr = inttoptr i32 %v1 to i32*
-  %_v0 = load i32* %v1.asptr, align 1
+  %__2 = inttoptr i32 %v1 to i32*
+  %_v0 = load i32* %__2, align 1
 
 ; CHECK:        entry:
-; CHECK-NEXT:       %v1.asptr = i32 %v1
+; CHECK-NEXT:       %__2 = i32 %v1
 ; CHECK-NEXT:       %_v0 = load i32* {{.*}}, align 1
 
-  %v2.asptr = inttoptr i32 %v2 to i32*
-  %_v1 = load i32* %v2.asptr, align 1
+  %__4 = inttoptr i32 %v2 to i32*
+  %_v1 = load i32* %__4, align 1
   %gep = add i32 %v2, 12
-  %gep.asptr = inttoptr i32 %gep to i32*
-  %_v2 = load i32* %gep.asptr, align 1
+  %__7 = inttoptr i32 %gep to i32*
+  %_v2 = load i32* %__7, align 1
   %mul = mul i32 %_v2, %_v1
   %gep6 = add i32 %v1, 4
-  %gep6.asptr = inttoptr i32 %gep6 to i32*
-  %_v3 = load i32* %gep6.asptr, align 1
+  %__11 = inttoptr i32 %gep6 to i32*
+  %_v3 = load i32* %__11, align 1
   %gep8 = add i32 %v2, 8
-  %gep8.asptr = inttoptr i32 %gep8 to i32*
-  %_v4 = load i32* %gep8.asptr, align 1
+  %__14 = inttoptr i32 %gep8 to i32*
+  %_v4 = load i32* %__14, align 1
   %gep10 = add i32 %v2, 4
-  %gep10.asptr = inttoptr i32 %gep10 to i32*
-  %_v5 = load i32* %gep10.asptr, align 1
+  %__17 = inttoptr i32 %gep10 to i32*
+  %_v5 = load i32* %__17, align 1
   %mul3 = mul i32 %_v5, %_v4
   %gep12 = add i32 %v1, 8
-  %gep12.asptr = inttoptr i32 %gep12 to i32*
-  %_v6 = load i32* %gep12.asptr, align 1
+  %__21 = inttoptr i32 %gep12 to i32*
+  %_v6 = load i32* %__21, align 1
   %mul7 = mul i32 %_v6, %_v3
   %mul9 = mul i32 %mul7, %_v6
   %gep14 = add i32 %v1, 12
-  %gep14.asptr = inttoptr i32 %gep14 to i32*
-  %_v7 = load i32* %gep14.asptr, align 1
+  %__26 = inttoptr i32 %gep14 to i32*
+  %_v7 = load i32* %__26, align 1
   %mul11 = mul i32 %mul9, %_v7
   %add4.neg = add i32 %mul, %_v0
   %add = sub i32 %add4.neg, %_v3
   %sub = sub i32 %add, %mul3
   %sub12 = sub i32 %sub, %mul11
   ret i32 %sub12
 
 ; CHECK:        %sub12 = sub i32 %sub, %mul11
 ; CHECK-NEXT:       ret i32 %sub12
 }
 
 ; ERRORS-NOT: ICE translation error
 ; DUMP-NOT: SZ