[PATCH, libstdc++] Improve slightly __cxa_guard_acquire

[Thiago Macieira]

Hello

The attached patch is a simple improvement to make a thread that failed to set 
the waiting bit to exit the function earlier, if it detects that another 
thread has successfully finished initialising. It matches the CAS code from a 
few lines above.

The change from RELAXED to ACQUIRE is noted in the previous patch I've just 
sent.
-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center
     Intel Sweden AB - Registration Number: 556189-6027
     Knarrarnäsgatan 15, 164 40 Kista, Stockholm, Sweden
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