Update the sysroot expectation to match other targets and breakout
linux/musl toolchain tests into a new file.
Differential Revision: https://reviews.llvm.org/D77440
Git does not store empty subdirectories (while SVN does). Git clone of
the clang repository did not create the fake Hexagon installation tree
used for testing the driver. This only became evident after a change
in the Hexagon toolchain that started checking for existence of certain
directories.
llvm-svn: 284402
Sid Manning