Changes

Fix error in run_info
The builtin assembler as never accepeted -v. If we find that, lets just
mention we are using the builtin, instead of leaving a warning int he
run-info.
git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@335678
91177308-0d34-0410-b5e6-96231b3b80d8

replace fragile version check with a better fragile version check
At least on Apple platforms it is not always the case that you can
compile this return 0 app without some flags relating to targets etc,
which we have no clue about this early in startup.
Printing the ld version directly fails because ld as invoked by clang 
still tries to link and can't find main. However, we can fix that by 
passing -dynamiclib so it does not look for main.
git-svn-id: https://llvm.org/svn/llvm-project/lnt/trunk@335679
91177308-0d34-0410-b5e6-96231b3b80d8