Add a basic TargetARM32 skeleton which knows nothing.

tests_lit/llvm2ice_tests/arith-opt.ll

Index: tests_lit/llvm2ice_tests/arith-opt.ll
diff --git a/tests_lit/llvm2ice_tests/arith-opt.ll b/tests_lit/llvm2ice_tests/arith-opt.ll
index 66be97f0bac4b92e22ca9cf5c272aab63723dea8..1f6a69b857de82c7bd7e6f294340fe9c0028f4fe 100644
--- a/tests_lit/llvm2ice_tests/arith-opt.ll
+++ b/tests_lit/llvm2ice_tests/arith-opt.ll
@@ -5,6 +5,13 @@
 
 ; RUN: %p2i -i %s --filetype=asm --args --verbose inst -threads=0 | FileCheck %s
 
+; TODO(jvoung): Enable test when it does not llvm::report_fatal_error.
+; The test runner wrappers don't handle error expected errors
+; so we can't just "not" the command.
+; RUIN: %if --need=target_ARM32 --command %p2i -i %s --filetype=asm \
+; RUIN:   --args --verbose inst -threads=0 --target arm32 \
+; RUIN:   | %if --need=target_ARM32 --command FileCheck %s --check-prefix ARM32
+
 define i32 @Add(i32 %a, i32 %b) {
 ; CHECK: define i32 @Add
 entry: