[clang] [flang] [flang][Driver] Enable -pie and -no-pie in flang's driver (PR #164890)

[Tarun Prabhu via cfe-commits]

tarunprabhu wrote:

Following investigation of the failure of pre-merge CI, I found that the tests were likely to fail on certain platforms. A number of tests have been added that check the behavior of -pie on various platforms. 

@DavidTruby, could you take a look at the Windows tests and see if they look reasonable? They pass for me, but I want to be certain that I have not made any bad assumptions.

@DanielCChen, @kkwli, could you do the same for AIX?

https://github.com/llvm/llvm-project/pull/164890