Subzero: Delete szdiff.py tests and ERRORS tests.

tests_lit/assembler/x86/immediate_encodings.ll

 ; Tests various aspects of x86 immediate encoding. Some encodings are shorter.
 ; For example, the encoding is shorter for 8-bit immediates or when using EAX.
 ; This assumes that EAX is chosen as the first free register in O2 mode.
 
 ; RUN: %p2i -i %s --args -O2 --verbose none \
 ; RUN:   | llvm-mc -triple=i686-none-nacl -filetype=obj \
 ; RUN:   | llvm-objdump -d --symbolize -x86-asm-syntax=intel - | FileCheck %s
-; RUN: %p2i -i %s --args --verbose none | FileCheck --check-prefix=ERRORS %s
-; RUN: %p2i -i %s --insts | %szdiff %s | FileCheck --check-prefix=DUMP %s
 
 define internal i32 @testXor8Imm8(i32 %arg) {
 entry:
   %arg_i8 = trunc i32 %arg to i8
   %result_i8 = xor i8 %arg_i8, 127
   %result = zext i8 %result_i8 to i32
   ret i32 %result
 }
 ; CHECK-LABEL: testXor8Imm8
 ; CHECK: 34 7f   xor al, 127
@@ skipping 283 matching lines @@
   %r4 = call i64 @llvm.ctlz.i64(i64 %w, i1 false)
   %res1 = add i64 %r, %r2
   %res2 = add i64 %r3, %r4
   %res = add i64 %res1, %res2
   ret i64 %res
 }
 ; CHECK-LABEL: test_via_ctlz_64
 ; CHECK-DAG: 85 c0 test eax, eax
 ; CHECK-DAG: 85 db test ebx, ebx
 ; CHECK-DAG: 85 f6 test esi, esi
-
-; ERRORS-NOT: ICE translation error
-; DUMP-NOT: SZ