[PATCH] Disable frame pointer elimination when -pg is used

[hfinkel at anl.gov]

> This also emits unused argument warnings when -fno-omit-frame-pointer or -mno-omit-leaf-frame-pointer are combined with -pg. It can be changed very simply, but I am not sure if this is desirable or not?

This is not desirable. The options are applicable to code generation, and should be processed from the user's perspective (even if they are now redundant). Users often specify options that are technically redundant on certain compiler versions.

http://reviews.llvm.org/D6370