[llvm] [PowerPC] Add error for incorrect use of memory operands (PR #114277)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-gcc-ubuntu` running on `sie-linux-worker3` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/8286

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'lld :: ELF/ppc64-local-exec-tls.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/ppc64-local-exec-tls.s -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/ppc64-local-exec-tls.s.tmp.o
+ /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/ppc64-local-exec-tls.s -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/lld/test/ELF/Output/ppc64-local-exec-tls.s.tmp.o
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/ppc64-local-exec-tls.s:65:3: error: invalid operand for instruction
  ld 3, b at tprel, 13
  ^
/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/lld/test/ELF/ppc64-local-exec-tls.s:74:3: error: invalid operand for instruction
  ld 3, b at tprel@l, 13
  ^

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/114277