Implements include/exclude register lists for translation.

tests_lit/llvm2ice_tests/unknown-arm-reg.ll

Index: tests_lit/llvm2ice_tests/unknown-arm-reg.ll
diff --git a/tests_lit/llvm2ice_tests/unknown-arm-reg.ll b/tests_lit/llvm2ice_tests/unknown-arm-reg.ll
new file mode 100644
index 0000000000000000000000000000000000000000..9878b3433366535ba8212fa5781e5d7e87519ac9
--- /dev/null
+++ b/tests_lit/llvm2ice_tests/unknown-arm-reg.ll
@@ -0,0 +1,13 @@
+; Show that we complain if an unknown register is specified on the command line.
+
+; Compile using standalone assembler.
+; RUN: %p2i --expect-fail --filetype=asm -i %s --target=arm32 --args -Om1 \
+; RUN:   -reg-use r2,xx9x,r5,yy28 -reg-exclude s1,sq5 2>&1 \
+; RUN:   | FileCheck %s
+
+define void @foo() {
+  ret void
+}
+
+; CHECK: LLVM ERROR: Unrecognized use/exclude registers: xx9x yy28 sq5
+