Make use of BSS more explicit in global initializers (vs a local .comm).

tests_lit/llvm2ice_tests/globalinit.pnacl.ll

 ; Test of global initializers.
 
 ; REQUIRES: allow_dump
 
 ; Test -ias=0 to test the lea "hack" until we are fully confident in -ias=1
 ; RUN: %p2i -i %s --args --verbose none -ias=0 | FileCheck %s
 
 ; Test -ias=1 and try to cross reference instructions w/ the symbol table.
 ; RUN: %p2i -i %s --args --verbose none \
 ; RUN:   | llvm-mc -triple=i686-none-nacl -filetype=obj \
@@ skipping 31 matching lines @@
 @ArrayInitPartial = internal global [40 x i8] c"<\00\00\00F\00\00\00P\00\00\00Z\00\00\00d\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00", align 4
 ; CHECK: .type ArrayInitPartial,@object
 ; CHECK-NEXT: .section .data,"aw",@progbits
 ; CHECK-NEXT: .align 4
 ; CHECK-NEXT: ArrayInitPartial:
 ; CHECK-NEXT: .byte
 ; CHECK: .size ArrayInitPartial, 40
 
 @PrimitiveInitStatic = internal global [4 x i8] zeroinitializer, align 4
 ; CHECK: .type PrimitiveInitStatic,@object
-; CHECK-NEXT: .local PrimitiveInitStatic
-; CHECK-NEXT: .comm PrimitiveInitStatic,4,4
+; CHECK-NEXT: .section .bss,"aw",@nobits
+; CHECK-NEXT: .align 4
+; CHECK-NEXT: PrimitiveInitStatic:
+; CHECK-NEXT: .zero 4
+; CHECK-NEXT: .size PrimitiveInitStatic, 4
 
 @PrimitiveUninit = internal global [4 x i8] zeroinitializer, align 4
 ; CHECK: .type PrimitiveUninit,@object
-; CHECK-NEXT: .local PrimitiveUninit
-; CHECK-NEXT: .comm PrimitiveUninit,4,4
+; CHECK-NEXT: .section .bss,"aw",@nobits
+; CHECK-NEXT: .align 4
+; CHECK-NEXT: PrimitiveUninit:
+; CHECK-NEXT: .zero 4
+; CHECK-NEXT: .size PrimitiveUninit, 4
 
 @ArrayUninit = internal global [20 x i8] zeroinitializer, align 4
 ; CHECK: .type ArrayUninit,@object
-; CHECK-NEXT: .local ArrayUninit
-; CHECK-NEXT: .comm ArrayUninit,20,4
+; CHECK-NEXT: .section .bss,"aw",@nobits
+; CHECK-NEXT: .align 4
+; CHECK-NEXT: ArrayUninit:
+; CHECK-NEXT: .zero 20
+; CHECK-NEXT: .size ArrayUninit, 20
 
 @ArrayUninitConstDouble = internal constant [200 x i8] zeroinitializer, align 8
 ; CHECK: .type ArrayUninitConstDouble,@object
 ; CHECK-NEXT: .section .rodata,"a",@progbits
 ; CHECK-NEXT: .align 8
 ; CHECK-NEXT: ArrayUninitConstDouble:
 ; CHECK-NEXT: .zero 200
 ; CHECK-NEXT: .size ArrayUninitConstDouble, 200
 
 @ArrayUninitConstInt = internal constant [20 x i8] zeroinitializer, align 4
@@ skipping 84 matching lines @@
 define internal i32 @nacl_tp_tdb_offset(i32 %__0) {
 entry:
   ret i32 0
 }
 
 define internal i32 @nacl_tp_tls_offset(i32 %size) {
 entry:
   %result = sub i32 0, %size
   ret i32 %result
 }