[PATCH] [lld] Start of a test suite for the Darwin driver

[Joe Ranieri]

The ld64_test patch adds basic infrastructure for testing that the Darwin
driver is parsing and validating command line arguments correctly. A flag,
-dump_args, has been added to the driver that will print out all of the
command line arguments that would create the MachOTargetInfo. This includes
arguments whose values are deduced by MachOTargetInfo::validate.

The ld64_executable_fix patch fixes the handling of the static executables,
making the test added in the first patch pass.

-- Joe Ranieri
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