[patch] Clang producing a L symbol in __DATA,__data

[Rafael Espíndola]

My understanding is that __DATA,__data is a section that is atomized
by the linker and cannot have L symbols.

A simple testcase is

@protocol P
-(void) im0;
@end
@interface A<P>
@end
@implementation A
@end

where clang currently prints

        .section        __DATA,__data
...
L_OBJC_PROTOCOLEXT_P:

With the attached patch we print l_OBJC_PROTOCOLEXT_P.

Cheers,
Rafael
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