[x86] Add Clang support for intrinsic __rdpmc.

This patch adds intrinsic __rdpmc to header file 'ia32intrin.h'.
Intrinsic __rdmpc can be used to read performance monitoring counters. It is
implemented as a direct call to __builtin_ia32_rdpmc.

It takes as input a value representing the index of the performance counter to
read. The value of the performance counter is then returned as a unsigned
64-bit quantity.



git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@212053 91177308-0d34-0410-b5e6-96231b3b80d8