The previous assert wasn't passing the TSFlags but the opcode, so wasn't
working.

Fixing it reveals that it was actually triggering, because we're too
strict with viota and vmsxf.m We already reduce the VL on these
instructions because the result in each element doesn't depend on VL.
However, it does change if masked, so account for that.

This PR adds the SFrameParser class and uses it from llvm-readobj to
dump the section contents. Currently, it only supports parsing the
SFrame section header. Other parts of the section will be added in
follow-up patches.

llvm-readobj uses the same sframe flag syntax as GNU readelf, but I have
not attempted match the output format of the tool. I'm starting with the
"llvm" output format because it's easier to generate and lets us
tweak the format to make it useful for testing the generation code. If
needed, support for the GNU format could be added by overriding this
functionality in the GNU ELF Dumper.

For more information, see the [sframe
specification](https://sourceware.org/binutils/wiki/sframe) and the
related
[RFC](https://discourse.llvm.org/t/rfc-adding-sframe-support-to-llvm/86900).

The instruction does `rd = (rs1 << shamt) + rs2` but the ISEL patterns
had `rs1` and `rs2` the other way around which is incorrect.

Clarify name as suggested in https://github.com/llvm/llvm-project/pull/149736,
as only FMaxNum and FMinNum are handled.

This is a fix additional to #92162

In some cases, section names contain a whitespace between the segment
name and the actual section name (e.g. `__TEXT, __swift5_proto`). It is
confirmed by source code of the Swift compiler

This fix allows LTO to work correctly with the `-ObjC` flag in that rare
case when only a section with a whitespace in the name is present in the
linked bitcode module, but there are no sections containing
`__TEXT,__swift`

---------

Co-authored-by: Ураков Александр Сергеевич <a.urakov@tbank.ru>
Co-authored-by: Ellis Hoag <ellis.sparky.hoag@gmail.com>

Check whether guid exists in pseudo probe desc when emitting pseudo
probe.

This reverts commit 60d2d94db253a9fdc7bd111120c803f808564b30.

Enabling one of MemorySSA or MD implies the other is off.