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

tests_lit/reader_tests/unnamed.ll

 ; Tests that we name unnamed global addresses.
 
 ; Check that Subzero's bitcode reader handles renaming correctly.
 ; RUN: %p2i --no-local-syms -i %s --insts | FileCheck %s
 ; RUN: %l2i --no-local-syms -i %s --insts | %ifl FileCheck %s
 
 ; RUN: %l2i --no-local-syms -i %s --insts --args --exit-success \
 ; RUN:      -default-function-prefix=h -default-global-prefix=g \
 ; RUN:      | %ifl FileCheck --check-prefix=BAD %s
 
 ; RUN: %p2i --no-local-syms -i %s --insts --args --exit-success \
 ; RUN:      -default-function-prefix=h -default-global-prefix=g \
 ; RUN:      | FileCheck --check-prefix=BAD %s
 
 ; RUN: %if --need=allow_disable_ir_gen --command \
 ; RUN:   %p2i -i %s --args -notranslate -timing -no-ir-gen \
 ; RUN: | %if --need=allow_disable_ir_gen --command \
 ; RUN:   FileCheck --check-prefix=NOIR %s
 
 ; TODO(kschimpf) Check global variable declarations, once generated.
 
 @0 = internal global [4 x i8] zeroinitializer, align 4
 @1 = internal constant [10 x i8] c"Some stuff", align 1
 @g = internal global [4 x i8] zeroinitializer, align 4
 
-define i32 @2(i32 %v) {
+define internal i32 @2(i32 %v) {
   ret i32 %v
 }
 
-; CHECK:      define i32 @Function(i32 %__0) {
+; CHECK:      define internal i32 @Function(i32 %__0) {
 ; CHECK-NEXT: __0:
 ; CHECK-NEXT:   ret i32 %__0
 ; CHECK-NEXT: }
 
-define void @hg() {
+define internal void @hg() {
   ret void
 }
 
 
-; CHECK-NEXT: define void @hg() {
+; CHECK-NEXT: define internal void @hg() {
 ; CHECK-NEXT: __0:
 ; CHECK-NEXT:   ret void
 ; CHECK-NEXT: }
 
-define void @3() {
+define internal void @3() {
   ret void
 }
 
-; CHECK-NEXT: define void @Function1() {
+; CHECK-NEXT: define internal void @Function1() {
 ; CHECK-NEXT: __0:
 ; CHECK-NEXT:   ret void
 ; CHECK-NEXT: }
 
-define void @h5() {
+define internal void @h5() {
   ret void
 }
 
-; CHECK-NEXT: define void @h5() {
+; CHECK-NEXT: define internal void @h5() {
 ; CHECK-NEXT: __0:
 ; CHECK-NEXT:   ret void
 ; CHECK-NEXT: }
 
 ; BAD: Warning : Default global prefix 'g' potentially conflicts with name 'g'.
 ; BAD: Warning : Default function prefix 'h' potentially conflicts with name 'h5'.
 
 ; NOIR: Total across all functions