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

tests_lit/llvm2ice_tests/globalinit.pnacl.ll

 ; Test of global initializers.
 
 ; REQUIRES: allow_dump
 
 ; Test initializers with -filetype=asm.
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=asm --target x8632 \
-; RUN:   -i %s --args -O2 | %if --need=target_X8632 --command FileCheck %s
+; RUN:   -i %s --args -O2 -allow-externally-defined-symbols \
+; RUN:   | %if --need=target_X8632 --command FileCheck %s
 
 ; RUN: %if --need=target_ARM32 --command %p2i --filetype=asm --target arm32 \
 ; RUN:   -i %s --args -O2 --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_ARM32 --command FileCheck %s
 
 ; Test instructions for materializing addresses.
 ; RUN: %if --need=target_X8632 --command %p2i --filetype=asm --target x8632 \
-; RUN:   -i %s --args -O2 \
+; RUN:   -i %s --args -O2 -allow-externally-defined-symbols \
 ; RUN: | %if --need=target_X8632 --command FileCheck %s --check-prefix=X8632
 
 ; Test instructions with -filetype=obj and try to cross reference instructions
 ; w/ the symbol table.
 ; RUN: %if --need=target_X8632 --command %p2i --assemble --disassemble \
 ; RUN:   --target x8632 -i %s --args --verbose none \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_X8632 --command FileCheck --check-prefix=IAS %s
 
 ; RUN: %if --need=target_X8632 --command %p2i --assemble --disassemble \
 ; RUN:   --dis-flags=-t --target x8632 -i %s --args --verbose none \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_X8632 --command FileCheck --check-prefix=SYMTAB %s
 
 ; This is not really IAS, but we can switch when that is implemented.
 ; For now we can at least see the instructions / relocations.
 ; RUN: %if --need=target_ARM32 --command %p2i --filetype=asm --assemble \
 ; RUN:   --disassemble --target arm32 -i %s \
 ; RUN:   --args --verbose none --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_ARM32 --command FileCheck \
 ; RUN:   --check-prefix=IASARM32 %s
 
 ; RUN: %if --need=target_ARM32 --command %p2i --filetype=asm --assemble \
 ; RUN:   --disassemble --dis-flags=-t --target arm32 -i %s \
 ; RUN:   --args --verbose none --skip-unimplemented \
+; RUN:   -allow-externally-defined-symbols \
 ; RUN:   | %if --need=target_ARM32 --command FileCheck --check-prefix=SYMTAB %s
 
 define internal i32 @main(i32 %argc, i32 %argv) {
 entry:
   %expanded1 = ptrtoint [4 x i8]* @PrimitiveInit to i32
   call void @use(i32 %expanded1)
   %expanded3 = ptrtoint [4 x i8]* @PrimitiveInitConst to i32
   call void @use(i32 %expanded3)
   %expanded5 = ptrtoint [4 x i8]* @PrimitiveInitStatic to i32
   call void @use(i32 %expanded5)
@@ skipping 155 matching lines @@
 ; CHECK: .section .rodata,"a",%progbits
 ; CHECK-NEXT: .p2align 2
 ; CHECK-NEXT: ArrayUninitConstInt:
 ; CHECK-NEXT: .zero 20
 ; CHECK-NEXT: .size ArrayUninitConstInt, 20
 
 @__init_array_start = internal constant [0 x i8] zeroinitializer, align 4
 @__fini_array_start = internal constant [0 x i8] zeroinitializer, align 4
 @__tls_template_start = internal constant [0 x i8] zeroinitializer, align 8
 @__tls_template_alignment = internal constant [4 x i8] c"\01\00\00\00", align 4