[PATCH] Make the driver respond to mdynamic-no-pic as per gcc.

[Iain Sandoe]

Hi!

Currently the driver responds to -mdynamic-no-pic, but not to -mno-dynamic-no-pic which tripped up a recent change to GCC bootstrap, since xcode 6.2 clang errors on "-mno-dynamic-no-pic".

The patch attached, fixes this by adding the missing option.
While I was in the vicinity, I fixed the FIXME for the missing warning about dynamic-no-pic overriding PIC and PIE.

The result is compatible with gcc-4.2.1 (and modern GCC trunk).

Testcase amendments are included for the new option and warning.

OK to apply?
Iain

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