[clang] [clang][bytecode] Implement arithmetic, bitwise and compound assignment operator (PR #108949)

[Rainer Orth via cfe-commits]

rorth wrote:

This patch broke the [Solaris/sparcv9 buildbot](https://lab.llvm.org/buildbot/#/builders/13/builds/2437).  The two affected tests use `-triple x86_64-linux-gnu` without requiring x86 support.

https://github.com/llvm/llvm-project/pull/108949