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

tests_lit/llvm2ice_tests/fp_const_pool.ll

Index: tests_lit/llvm2ice_tests/fp_const_pool.ll
diff --git a/tests_lit/llvm2ice_tests/fp_const_pool.ll b/tests_lit/llvm2ice_tests/fp_const_pool.ll
index c1fa9dfcca090b1b61c193b9d8bd340381449812..587e96719cd6c9e7206bd5172ae30dc1c2718d68 100644
--- a/tests_lit/llvm2ice_tests/fp_const_pool.ll
+++ b/tests_lit/llvm2ice_tests/fp_const_pool.ll
@@ -5,15 +5,15 @@
 
 ; REQUIRES: allow_dump
 
-define void @consume_float(float %f) {
+define internal void @consume_float(float %f) {
   ret void
 }
 
-define void @consume_double(double %d) {
+define internal void @consume_double(double %d) {
   ret void
 }
 
-define void @test_zeros() {
+define internal void @test_zeros() {
 entry:
   call void @consume_float(float 0.0)
   call void @consume_float(float -0.0)
@@ -34,7 +34,7 @@ entry:
 ; ZERO-NEXT: call void @consume_double(double -0.0
 
 
-define void @test_nans() {
+define internal void @test_nans() {
 entry:
   call void @consume_float(float 0x7FF8000000000000)
   call void @consume_float(float 0x7FF8000000000000)