After the base branch was moved to main, this somehow ended up
adding a second definition of RTLCI, instead of modifying the
existing one.

Also fix other build error with gcc bots.

This fixes the -fveclib flag getting lost on its way to the backend.

Previously this was its own cl::opt with a random boolean. Move the
flag handling into CommandFlags with other backend ABI-ish options,
and have clang directly set it, rather than forcing it to go through
command line parsing.

Prior to de68181d7f, codegen used TargetLibraryInfo to find the vector
function. Clang has special handling for TargetLibraryInfo, where it
would
directly construct one with the vector library in the pass pipeline.
RuntimeLibcallsInfo currently is not used as an analysis in codegen, and
needs to know the vector library when constructed.

RuntimeLibraryAnalysis could follow the same trick that
TargetLibraryInfo is using in the future, but a lot more boilerplate changes 
are needed to thread that analysis through codegen. Ideally this would come 
from an IR module flag, and nothing would be in TargetOptions. For now, it's 
better for all of these sorts of controls to be consistent.

This patch adds a Clang-compatible --save-stats option to opt, to
provide an easy to use way to save LLVM statistics files when working
with opt on the middle end.

This is a follow up on the addition to `llc`:
https://github.com/llvm/llvm-project/pull/163967

Like on Clang, one can specify --save-stats, --save-stats=cwd, and
--save-stats=obj with the same semantics and JSON format. The
pre-existing --stats option is not affected.

The implementation extracts the flag and its methods into the common
`CodeGen/CommandFlags` as `LLVM_ABI`, using a new registration class to
conservatively enable opt-in rather than let all tools take it. Its only
needed for llc and opt for now. Then it refactors llc and adds support
for opt.

This patch adds a new `FramePointerKind::NonLeafNoReserve` and makes it
the default for `-momit-leaf-frame-pointer`.

It also adds a new commandline option `-m[no-]reserve-frame-pointer-reg`.

This should fix #154379, the main impact of this patch can be found in
`clang/lib/Driver/ToolChains/CommonArgs.cpp`.

Hope this can unblock #105746.

Remove `UnsafeFPMath` uses, next is removing the command line option.

Remove "approx-func-fp-math" attribute and related command line option,
users should always use afn flag in IR.
Resolve FIXME in `TargetMachine::resetTargetOptions` partially.

This reverts commit 05e08cdb3e576cc0887d1507ebd2f756460c7db7.
Adding the missing -mtriple flags in MIR/X86 test files which caused
these tests to fail which was the reason for reverting the patch.

Reverts llvm/llvm-project#87574, which breaks LLVM ::
CodeGen/MIR/X86/call-site-info-ambiguous-indirect-call-typeid.mir tests
on linux-arm64 builders.

Introducing `EnableCallGraphSection` target option to add
CalleeTypeIds field in CallSiteInfo. Read the callee type ids
in and out by the MIR parser/printer.

Reviewers: ilovepi

Reviewed By: ilovepi

Pull Request: https://github.com/llvm/llvm-project/pull/87574