Make sure that all globals are internal, except for "start" functions.

tests_lit/llvm2ice_tests/bool-opt.ll

Index: tests_lit/llvm2ice_tests/bool-opt.ll
diff --git a/tests_lit/llvm2ice_tests/bool-opt.ll b/tests_lit/llvm2ice_tests/bool-opt.ll
index a57475858e59b7e477c7750dc3ffb28ad4f3ed52..c7a31e0cdf1cdb2f26a7fd40ba41eff9b12a7b87 100644
--- a/tests_lit/llvm2ice_tests/bool-opt.ll
+++ b/tests_lit/llvm2ice_tests/bool-opt.ll
@@ -1,10 +1,11 @@
 ; Trivial smoke test of icmp without fused branch opportunity.
 
-; RUN: %p2i -i %s --filetype=obj --disassemble --args | FileCheck %s
+; RUN: %p2i -i %s --filetype=obj --disassemble --args \
+; RUN:   -allow-externally-defined-symbols | FileCheck %s
 
 ; Check that correct addressing modes are used for comparing two
 ; immediates.
-define void @testIcmpImm() {
+define internal void @testIcmpImm() {
 entry:
   %cmp = icmp eq i32 1, 2
   %cmp_ext = zext i1 %cmp to i32