Created using spr 1.3.6-beta.1

[skip ci]

Reverts llvm/llvm-project#87529

Reverts #87518

https://lab.llvm.org/buildbot/#/builders/37/builds/33262 is still broken

By generic intrinsics this mean things like dup, ext, zip and bsl that
can always be executed with integer s16 operations and do not require
fullfp16. This makes them always available, and brings them inline with
GCC.
https://godbolt.org/z/azs8eMv54

The relevant test cases have been moved into their own files, to allow
them to be tested with armv8-a and armv8.2-a+fp16.

Reverts llvm/llvm-project#87518

Revert is not needed as the regression was fixed with
1189e87951e59a81ee097eae847c06008276fef1.

I assumed the crash and warning are different issues, but according to
https://lab.llvm.org/buildbot/#/builders/240/builds/26629
fixing warning resolves the crash.

Reverts llvm/llvm-project#75481

Breaks multiple bots, see #75481

This patch fixes:

  clang/lib/CodeGen/CGExpr.cpp:5607:11: error: variable 'Result' is
  used uninitialized whenever 'if' condition is false
  [-Werror,-Wsometimes-uninitialized]

This patch implements the implicit truncation and implicit sign change
checks for bitfields using UBSan. E.g.,
`-fsanitize=implicit-bitfield-truncation` and
`-fsanitize=implicit-bitfield-sign-change`.

Empty structs are ignored for parameter passing purposes, but va_arg was
incrementing the pointer anyway for that the size of empty struct in c++
is 1 byte, which could lead to va_list getting out of sync. Fix #86057.

- Factor out a shouldCastToInt() method.
- Also pass through pointer type values to not be casted to integer.

CC @uweigand