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

tests_lit/llvm2ice_tests/reorder-functions.ll

 ; This is a smoke test of function reordering.
 
 ; RUN: %p2i -i %s --filetype=obj --disassemble --args -O2 \
 ; RUN:    -sz-seed=1 -reorder-functions \
 ; RUN:    | FileCheck %s --check-prefix=DEFAULTWINDOWSIZE
 ; RUN: %p2i -i %s --filetype=obj --disassemble --args -Om1 \
 ; RUN:    -sz-seed=1 -reorder-functions \
 ; RUN:    | FileCheck %s --check-prefix=DEFAULTWINDOWSIZE
 
 
@@ skipping 19 matching lines @@
 
 ; RUN: %p2i -i %s --filetype=obj --disassemble --args -O2 \
 ; RUN:    -sz-seed=1 -reorder-functions \
 ; RUN:    -reorder-functions-window-size=0xffffffff \
 ; RUN:    | FileCheck %s --check-prefix=WINDOWSIZEMAX
 ; RUN: %p2i -i %s --filetype=obj --disassemble --args -Om1 \
 ; RUN:    -sz-seed=1 -reorder-functions \
 ; RUN:    -reorder-functions-window-size=0xffffffff \
 ; RUN:    | FileCheck %s --check-prefix=WINDOWSIZEMAX
 
-define void @func1() {
+define internal void @func1() {
   ret void
 }
 
-define void @func2() {
+define internal void @func2() {
   ret void
 }
 
-define void @func3() {
+define internal void @func3() {
   ret void
 }
 
-define void @func4() {
+define internal void @func4() {
   ret void
 }
 
-define void @func5() {
+define internal void @func5() {
   ret void
 }
 
-define void @func6() {
+define internal void @func6() {
   ret void
 }
 
 ; DEFAULTWINDOWSIZE-LABEL: func1
 ; DEFAULTWINDOWSIZE-LABEL: func4
 ; DEFAULTWINDOWSIZE-LABEL: func5
 ; DEFAULTWINDOWSIZE-LABEL: func2
 ; DEFAULTWINDOWSIZE-LABEL: func6
 ; DEFAULTWINDOWSIZE-LABEL: func3
 
@@ skipping 10 matching lines @@
 ; SEQUENTIAL-LABEL: func4
 ; SEQUENTIAL-LABEL: func5
 ; SEQUENTIAL-LABEL: func6
 
 ; WINDOWSIZEMAX-LABEL: func1
 ; WINDOWSIZEMAX-LABEL: func4
 ; WINDOWSIZEMAX-LABEL: func5
 ; WINDOWSIZEMAX-LABEL: func2
 ; WINDOWSIZEMAX-LABEL: func6
 ; WINDOWSIZEMAX-LABEL: func3