Support gcc gdwarf symbols for arrays

[dotjulia]

Support DW_AT_upper_bound for arrays
gcc:

0x000003de:   DW_TAG_array_type
                DW_AT_type	(0x000000a2 "char")

0x000003e3:     DW_TAG_subrange_type
                  DW_AT_type	(0x00000039 "long unsigned int")
                  DW_AT_upper_bound	(0x63)

0x000003e9:     NULL

clang (supported):

0x0000012a:   DW_TAG_array_type
                DW_AT_type	(0x00000047 "char")

0x0000012f:     DW_TAG_subrange_type
                  DW_AT_type	(0x0000004e "__ARRAY_SIZE_TYPE__")
                  DW_AT_count	(0x64)

0x00000135:     NULL