merge clang-16.0.6

Downgrade riscv64-specific LTO error to a warning

Error happens when mixing some PIC and non-PIC code in an LTO build/link

ld: error: linking module flags 'SmallDataLimit': IDs have conflicting v

Downgrade riscv64-specific LTO error to a warning

Error happens when mixing some PIC and non-PIC code in an LTO build/link

ld: error: linking module flags 'SmallDataLimit': IDs have conflicting values in '<REDACTED>.o' and 'ld-temp.o'

and affects a few ports now. Issue reported upstream where the proposed
fix uses llvm::Module::Min, which we don't have and would require
a backport. For now, work around this issue by downgrading to
a warning, which should have the intended effect in most cases (use the
value of the first module, which is smaller than the defaults value used
by ld-temp.o).

ok kettenis@

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Import LLVM 13.0.0 release.

Import LLVM 11.1.0 release including clang, lld and lldb.

Import LLVM 10.0.1 including clang, lld and lldb.

Import LLVM 10.0.0 release including clang, lld and lldb.

ok hackroom
tested by plenty