Created using spr 1.3.4

Sharing the same algorithm as double precision sin:
https://github.com/llvm/llvm-project/pull/95736

Adds support in MIR parser for parsing bfloat immediates, and adds a
test for this.

If the base node is signed, but some values are unsigned, still the
whole node should be considered signed. Also, an extra bitwidth analysis
should be performed, when estimating the minimal bitwidth.

This pull request will change the merging of ``debug_str_offset`` to
merge per contribution and correctly copy over each contribution header
to the merged section. I have added some test data which is in dwarf5
format as this is where the section contribution header was introduced,
as far as i can tell.

The VReg2SUnitMap type is not used anywhere (it has probably been
obsolete since commit 97d0ffbe0647c4ec49ed4 back in 2015). This commit
simply removes the type definition.

On ELF platforms, the instrumentation registers global variables using
`__asan_register_elf_globals` for the default `UseGlobalsGC` case. If
all instrumented global variables in a module are discarded by linker
GC, we will have `start == stop`.

Normally `start == 0`, but `start != 0` is possible with a linker script
retaining `asan_globals`. The called `__asan_register_globals` would
access out-of-bounds `globals[n-1]`, though there is likely no runtime
failure.

Pull Request: https://github.com/llvm/llvm-project/pull/96529

AvailableExternally linkage is interesting because, in ThinLTO cases, it
means the function may get elided if it survives inlining - see
`elim-avail-extern` pass.