check-clang: Introduce get_llvm_config_props in clang/test/lit.cfg.
In trunk, we can use features as below:
aarch64-registered-target
hexagon-registered-target
msp430-registered-target
r600-registered-target
systemz-registered-target
xcore-registered-target
Each of them, as below, implies corresponding subtargets:
arm-registered-target -- arm, thumb
mips-registered-target -- mips, mips64, mips64el, mipsel
nvptx-registered-target -- nvptx, nvptx64
sparc-registered-target -- sparc, sparcv9
x86-registered-target -- x86, x86-64
They will be renamed:
cppbackend-registered-target -- was "cpp". Unused in trunk.
powerpc-registered-target -- was "ppc32", "ppc64" and "ppc64le".
The feature "asserts" is also taken from llvm-config.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@196347
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