Warning: to be commited on "flag day", so marking as "Plan Changes"
This enables LLVM as default toolchain/compiler/linker for PowerPC and PowerPC64 platforms.
I mean, it seems this specific __LLVM_TARGET_FILT change is a bug fix that should go in before the flag day? Any use of Clang on powerpc64 is inherently not the default but needs this change? It doesn't really matter if this doesn't go in until later, just something I wondered about.
oh yeah, this is bug fix! I guess it could go in before, but I personally didn't verified for undesired side effects with current default ABI.