[perfmon2] libpfm reg_alt_addr implemented

[Stephane E. <er...@hp...>]

Hello,

Following our discussion a few weeks ago, I went ahead and implemented
a new field in pfmlib_reg_t to optionally return an alternate hardware
address for PMU registers. This new field is used on X86 to return the
RDPMC index for counter registers. For all other registers, the field
contains the MSR address. On Itanium, reg_addr == reg_alt_addr as one
would expect.

I have updated the X86, Itanium code to add reg_alt_addr support. Please
check your architecture module to update the code as appropriate.

The patch has been pushed to libpfm CVS.

Thanks.

-- 

-Stephane