For macppc, add missing CFI for cr2, cr3, cr4

clang -S was missing a line like ".cfi_offset cr2, -16" in functions
that spill cr2 (or cr3, cr4) to the stack. This was breaking a few
C++ exceptions.

For macppc, add missing CFI for cr2, cr3, cr4

clang -S was missing a line like ".cfi_offset cr2, -16" in functions
that spill cr2 (or cr3, cr4) to the stack. This was breaking a few
C++ exceptions. This fix adds the missing CFI.

This will fix the C++ exception that was crashing egdb from
ports/devel/gdb when you did "q to quit" in the pager.

ok kettenis@ tobhe@

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merge llvm-16.0.6

Merge LLVM 13.0.0.

Merge LLVM 11.1.0.

Add RETGUARD implementation for powerpc and powerpc64.

ok deraadt@ kettenis@

Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty