Add more cache events

[tkf]

This PR adds LLC-* and L1-dcache-store*. Not all machines support them, but I get this in one machine:

julia> LinuxPerf.list()
...

cache:
  L1-dcache-load-misses    user, kernel, hypervisor
  L1-dcache-loads          user, kernel, hypervisor
  L1-dcache-store-misses   not supported
  L1-dcache-stores         user, kernel, hypervisor
  L1-icache-load-misses    user, kernel, hypervisor
  L1-icache-loads          not supported
  LLC-load-misses          user, kernel, hypervisor
  LLC-loads                user, kernel, hypervisor
  LLC-store-misses         user, kernel, hypervisor
  LLC-stores               user, kernel, hypervisor
  dTLB-load-misses         user, kernel, hypervisor
  dTLB-loads               user, kernel, hypervisor
  iTLB-load-misses         user, kernel, hypervisor
  iTLB-loads               user, kernel, hypervisor

which seems to match with perf list output:

  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]
  L1-icache-load-misses                              [Hardware cache event]
  LLC-load-misses                                    [Hardware cache event]
  LLC-loads                                          [Hardware cache event]
  LLC-store-misses                                   [Hardware cache event]
  LLC-stores                                         [Hardware cache event]
  branch-load-misses                                 [Hardware cache event]
  branch-loads                                       [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  dTLB-loads                                         [Hardware cache event]
  dTLB-store-misses                                  [Hardware cache event]
  dTLB-stores                                        [Hardware cache event]
  iTLB-load-misses                                   [Hardware cache event]
  iTLB-loads                                         [Hardware cache event]
  node-load-misses                                   [Hardware cache event]
  node-loads                                         [Hardware cache event]
  node-store-misses                                  [Hardware cache event]
  node-stores                                        [Hardware cache event]