[runtimes] Properly handle the sysroot/triple/gcc-toolchain
In 395271ad, I simplified how we handled the target triple for the runtimes. However, in doing so, we stopped considering the default in CMAKE_CXX_COMPILER_TARGET, so we'd use the LLVM_DEFAULT_TARGET_TRIPLE (which is the host triple) even if CMAKE_CXX_COMPILER_TARGET was specified. This commit fixes that problem and also refactors the code so that it's easy to see what the default value is. The fact that nobody seems to have been broken by this makes me think that perhaps nobody is using CMAKE_CXX_COMPILER_TARGET to specify the triple -- but it should still work. Differential Revision: https://reviews.llvm.org/D111672
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