function calc_gtn_flags() to calculate the GN_LOCAL flag 
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#define  | GN_VISIBLE   0x0001 | 
|   | replace forbidden characters by SUBSTCHAR 
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#define  | GN_COLORED   0x0002 | 
|   | return colored name 
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#define  | GN_DEMANGLED   0x0004 | 
|   | return demangled name 
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#define  | GN_STRICT   0x0008 | 
|   | fail if cannot demangle 
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#define  | GN_SHORT   0x0010 | 
|   | use short form of demangled name 
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#define  | GN_LONG   0x0020 | 
|   | use long form of demangled name 
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#define  | GN_LOCAL   0x0040 | 
|   | try to get local name first; if failed, get global 
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#define  | GN_ISRET   0x0080 | 
|   | for dummy names: use retloc 
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#define  | GN_NOT_ISRET   0x0100 | 
|   | for dummy names: do not use retloc 
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#define  | GN_NOT_DUMMY   0x0200 | 
|   | do not return a dummy name 
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