[profile] clean up runtime warnings.
[profile] clean up runtime warnings.

 o make warning message more meaningful to users.
 o add suggestion to fix the problem
 o limit the max number of output.




git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@270483 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt