-rt x86_64 fix for latency tracing

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Ingo/Steve,

The included patch fixes a bug that causes a segfault in the init
thread when latency tracing is enabled on x86_64 kernels. Not sure if
it's completely correct, but it gets me past my segfault and lets me
complete booting.

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 066497a..b124409 100644
- --- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -1089,7 +1089,7 @@ ENTRY(mcount)
 
        mov 0x0(%rbp),%rax
        mov 0x8(%rbp),%rdi
- -       mov 0x8(%rax),%rsi
+       mov 0x10(%rax),%rsi
 
        call   __trace

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