backport libm markers that trigger when an elementary function takes the slow path

Issue

• Please backport the following libm markers from Fedora 17 to RHEL6

$ eu-readelf -n libm.so  | grep Name
    Provider: libm, Name: slowexp_p6, Args: '8@%rax 8@%rbx'
    Provider: libm, Name: slowexp_p32, Args: '8@%rax 8@%rbx'
    Provider: libm, Name: slowpow_p6, Args: '8@%rax 8@%rdx 8@%rcx 8@%rbx'
    Provider: libm, Name: slowpow_p32, Args: '8@%rax 8@%rdx 8@%rcx 8@%rbx'
    Provider: libm, Name: slowexp_p6, Args: '8@%rax 8@%rbx'
    Provider: libm, Name: slowexp_p32, Args: '8@%rax 8@%rbx'
    Provider: libm, Name: slowpow_p6, Args: '8@%rax 8@%rdx 8@%rcx 8@%rbx'
    Provider: libm, Name: slowpow_p32, Args: '8@%rax 8@%rdx 8@%rcx 8@%rbx'
    Provider: libm, Name: slowexp_p6, Args: '8@%rax 8@%rbx'
    Provider: libm, Name: slowexp_p32, Args: '8@%rax 8@%rbx'

• The functionality would greatly enhance the ability to troubleshoot issues.
• The fact that debuginfo is not needed, the targets are in areas of interest and that the target is a named location are motivating factors for this request.