Remove unused "isMain" field from DICompileUnit

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176910 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/DebugInfo/array.ll b/test/DebugInfo/array.ll
index cb599f0..2dbc72e 100644
--- a/test/DebugInfo/array.ll
+++ b/test/DebugInfo/array.ll
@@ -17,7 +17,7 @@
 
 !0 = metadata !{i32 786478, i32 0, metadata !1, metadata !"main", metadata !"main", metadata !"", metadata !1, i32 3, metadata !3, i1 false, i1 true, i32 0, i32 0, i32 0, i32 0, i1 false, i32 ()* @main, null, null, null, i32 3} ; [ DW_TAG_subprogram ]
 !1 = metadata !{i32 786473, metadata !"array.c", metadata !"/private/tmp", metadata !2} ; [ DW_TAG_file_type ]
-!2 = metadata !{i32 786449, i32 0, i32 12, metadata !"array.c", metadata !"/private/tmp", metadata !"clang version 3.0 (trunk 129138)", i1 true, i1 false, metadata !"", i32 0, null, null, metadata !13, null, null} ; [ DW_TAG_compile_unit ]
+!2 = metadata !{i32 786449, i32 0, i32 12, metadata !"array.c", metadata !"/private/tmp", metadata !"clang version 3.0 (trunk 129138)", i1 false, metadata !"", i32 0, null, null, metadata !13, null, null} ; [ DW_TAG_compile_unit ]
 !3 = metadata !{i32 786453, metadata !1, metadata !"", metadata !1, i32 0, i64 0, i64 0, i32 0, i32 0, i32 0, metadata !4, i32 0, i32 0} ; [ DW_TAG_subroutine_type ]
 !4 = metadata !{metadata !5}
 !5 = metadata !{i32 786468, metadata !2, metadata !"int", null, i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ]