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

tests_lit/llvm2ice_tests/select-opt.ll

 ; Simple test of the select instruction.  The CHECK lines are only
 ; checking for basic instruction patterns that should be present
 ; regardless of the optimization level, so there are no special OPTM1
 ; match lines.
 
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
-; RUN:   --target x8632 -i %s --args -O2 \
+; RUN:   --target x8632 -i %s --args -O2 -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_X8632 --command FileCheck %s
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
-; RUN:   --target x8632 -i %s --args -Om1 \
+; RUN:   --target x8632 -i %s --args -Om1 -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_X8632 --command FileCheck %s
 
 ; RUN: %if --need=target_ARM32 --need=allow_dump \
 ; RUN:   --command %p2i --filetype=asm --assemble \
 ; RUN:   --disassemble --target arm32 -i %s --args -O2 --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_ARM32 --need=allow_dump \
 ; RUN:   --command FileCheck --check-prefix ARM32 %s
 ; RUN: %if --need=target_ARM32 --need=allow_dump \
 ; RUN:   --command %p2i --filetype=asm --assemble \
 ; RUN:   --disassemble --target arm32 -i %s --args -Om1 --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_ARM32 --need=allow_dump \
 ; RUN:   --command FileCheck --check-prefix ARM32 %s
 
-define void @testSelect(i32 %a, i32 %b) {
+define internal void @testSelect(i32 %a, i32 %b) {
 entry:
   %cmp = icmp slt i32 %a, %b
   %cond = select i1 %cmp, i32 %a, i32 %b
   tail call void @useInt(i32 %cond)
   %cmp1 = icmp sgt i32 %a, %b
   %cond2 = select i1 %cmp1, i32 10, i32 20
   tail call void @useInt(i32 %cond2)
   ; Create "fake" uses of %cmp and %cmp1 to prevent O2 bool folding.
   %d1 = zext i1 %cmp to i32
   call void @useInt(i32 %d1)
@@ skipping 18 matching lines @@
 ; ARM32: bl {{.*}} useInt
 ; ARM32: cmp
 ; ARM32: cmp
 ; ARM32: mov {{.*}}, #20
 ; ARM32: movne {{.*}}, #10
 ; ARM32: bl {{.*}} useInt
 ; ARM32: bx lr
 
 ; Check for valid addressing mode in the cmp instruction when the
 ; operand is an immediate.
-define i32 @testSelectImm32(i32 %a, i32 %b) {
+define internal i32 @testSelectImm32(i32 %a, i32 %b) {
 entry:
   %cond = select i1 false, i32 %a, i32 %b
   ret i32 %cond
 }
 ; CHECK-LABEL: testSelectImm32
 ; CHECK-NOT: cmp 0x{{[0-9a-f]+}},
 ; ARM32-LABEL: testSelectImm32
 ; ARM32-NOT: cmp #{{.*}},
 
 ; Check for valid addressing mode in the cmp instruction when the
 ; operand is an immediate.  There is a different x86-32 lowering
 ; sequence for 64-bit operands.
-define i64 @testSelectImm64(i64 %a, i64 %b) {
+define internal i64 @testSelectImm64(i64 %a, i64 %b) {
 entry:
   %cond = select i1 true, i64 %a, i64 %b
   ret i64 %cond
 }
 ; CHECK-LABEL: testSelectImm64
 ; CHECK-NOT: cmp 0x{{[0-9a-f]+}},
 ; ARM32-LABEL: testSelectImm64
 ; ARM32-NOT: cmp #{{.*}},