[LLVMdev] Fix crash in llvm_gcda_emit_arcs()

[Joseph Kain]

Hi,

I've been seeing a crash in llvm_gcda_emit_arcs() on x86_64.  The crash
occurs executing a movdqa instruction with an unaligned src address.  The
attached patch to the compiler-rt project fixes the problem by using
memcpy() to read data from the write_buffer[] in GCDAProfiling.c.

This is my first patch submission to llvm so please let me know if I've
missed any steps.  I'm not on the mailing list so please include me on any
replies.

I haven't run the tests on this change but would be happy to do so if
someone could point me to documentation on how to do so.  I couldn't find
testing instructions linked from http://llvm.org/docs/DeveloperPolicy.html.
 I have built the change and run it with the programs I was testing
originally.  With this change the crash no longer occurs.

Thanks,
Joseph Kain
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