x86 vDSO: compile with -g, 64-bit
The 64-bit vDSO's sources are compiled with -g0 for no good reason. Using -g when enabled lets their separate debug files be used at runtime via build ID matching, same as we can see 32-bit vDSO's assembly sources. Signed-off-by: NRoland McGrath <roland@redhat.com> Acked-by: NSam Ravnborg <sam@ravnborg.org> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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