RETGUARD for powerpc and powerpc64 added to -current

Contributed by rueda on 2020-10-13 from the guard the power dept.

Todd Mortimer (mortimer@) has committed RETGUARD (see previous coverage) for the macppc (powerpc) and powerpc64 platforms:

CVSROOT:	/cvs
Module name:	src
Changes by:	mortimer@cvs.openbsd.org	2020/10/12 08:52:09

Modified files:
	gnu/llvm/clang/lib/Driver/ToolChains: Clang.cpp 
	gnu/llvm/llvm/lib/Target/PowerPC: CMakeLists.txt 
	                                  PPCAsmPrinter.cpp 
	                                  PPCFrameLowering.cpp 
	                                  PPCFrameLowering.h 
	                                  PPCInstrInfo.td 
	gnu/usr.bin/clang/libLLVMPowerPCCodeGen: Makefile 
Added files:
	gnu/llvm/llvm/lib/Target/PowerPC: PPCReturnProtectorLowering.cpp 
	                                  PPCReturnProtectorLowering.h 

Log message:
Add RETGUARD implementation for powerpc and powerpc64.

ok deraadt@ kettenis@

See the Innovations page for the full list of platforms on which RETGUARD is implemented.

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