Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
10.0.1 final (aka llvmorg-10.0.1-0-gef32c611aa2).

MFC r360702:

Merge commit 4ca2cad94 from llvm git (by Justin Hibbits):

[PowerPC] Add clang -msvr4-struct-return for 32-bit ELF

Summary:

Change the default ABI to be compatible with GCC. For 32-bit ELF
targets other than Linux, Clang now returns small structs in
registers r3/r4. This affects FreeBSD, NetBSD, OpenBSD. There is no
change for 32-bit Linux, where Clang continues to return all structs
in memory.

Add clang options -maix-struct-return (to return structs in memory)
and -msvr4-struct-return (to return structs in registers) to be
compatible with gcc. These options are only for PPC32; reject them on
PPC64 and other targets. The options are like -fpcc-struct-return and
-freg-struct-return for X86_32, and use similar code.

To actually return a struct in registers, coerce it to an integer of
the same size. LLVM may optimize the code to remove unnecessary
accesses to memory, and will return i32 in r3 or i64 in r3:r4.

Fixes PR#40736

Patch by George Koehler!

Reviewed By: jhibbits, nemanjai
Differential Revision: https://reviews.llvm.org/D73290

Requested by: jhibbits

MFC r361410:

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
llvmorg-10.0.1-rc1-0-gf79cd71e145 (aka 10.0.1 rc1).

MFC r362235 (by kp):

llvm: Default to -mno-relax on RISC-V

Compiling on a RISC-V system fails with 'relocation R_RISCV_ALIGN
requires unimplemented linker relaxation; recompile with -mno-relax'.

Our default linker (ld.lld) doesn't support relaxation, so default to
no-relax so we don't generate object files the linker can't handle.

Reviewed by: mhorne
Sponsored by: Axiado
Differential Revision: https://reviews.freebsd.org/D25210

MFC r362445:

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
llvmorg-10.0.0-97-g6f71678ecd2 (not quite 10.0.1 rc2, as more fixes are
still pending).

MFC r362587 (by cem):

Add WITH_CLANG_FORMAT option

clang-format is enabled conditional on either WITH_CLANG_EXTRAS or
WITH_CLANG_FORMAT. Some sources in libclang are build conditional on
either rule, and obviously the clang-format binary itself depends on the
rule.

clang-format could still use a manual page.

Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D25427

MFC r362609:

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
llvmorg-10.0.0-129-gd24d5c8e308. Getting closer to 10.0.1-rc2.

MFC r362679:

Regenerate ReStructuredText based manpages for llvm-project tools:

• bugpoint.1
• clang.1
• llc.1
• lldb.1
• lli.1
• llvm-ar.1
• llvm-as.1
• llvm-bcanalyzer.1
• llvm-cov.1
• llvm-diff.1
• llvm-dis.1
• llvm-dwarfdump.1
• llvm-extract.1
• llvm-link.1
• llvm-mca.1
• llvm-nm.1
• llvm-pdbutil.1
• llvm-profdata.1
• llvm-symbolizer.1
• llvm-tblgen.1
• opt.1

Add newly generated manpages for:

• llvm-addr2line.1 (this is an alias of llvm-symbolizer)
• llvm-cxxfilt.1
• llvm-objcopy.1
• llvm-ranlib.1 (this is an alias of llvm-ar)

Note that llvm-objdump.1 is an exception, as upstream has both a plain
.1 file, and a .rst variant. These will have to be reconciled upstream
first.

MFC r362680:

Follow-up to r362679, add more entries to OptionalObsoleteFiles.inc

MFC r362719:

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
llvmorg-10.0.1-rc2-0-g77d76b71d7d.

Also add a few more llvm utilities under WITH_CLANG_EXTRAS:

• llvm-dwp, a utility for merging DWARF 5 Split DWARF .dwo files into .dwp (DWARF package files)
• llvm-size, a size(1) replacement
• llvm-strings, a strings(1) replacement

MFC r362733:

Remove older llvm-ranlib.1 entry from ObsoleteFiles.inc, as it has
gotten its own manpage now, and should be no longer be removed by "make
delete-old".

MFC r362734:

Fix llvm-strings.1 not installing, this was a copy/paste error.

MFC r363401:

Merge llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp
10.0.1 final (aka llvmorg-10.0.1-0-gef32c611aa2).

There were no changes since rc2, except in the upstream regression
tests, which we do not ship.

Relnotes: yes