[compiler-rt] [compiler-rt][ARM] Add missing PACBTI support to assembly aeabi functions (PR #142400)

[Peter Smith via llvm-commits]

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@@ -37,6 +42,12 @@ DEFINE_COMPILERRT_FUNCTION(__aeabi_cfcmpeq)
         movs r0, #0xF
         lsls r0, r0, #31
         pop {r0-r3, pc}
+#else
+#if defined(__ARM_FEATURE_PAC_DEFAULT)
+        pop {r0-r3, r12, lr}
+        aut r12, lr, sp
+        beq 2f
----------------
smithp35 wrote:

Similar comment to above. I think you can get rid of
```
beq 2f
b __aeabi_cfcmple
```
and move the #endif to be after `pop {r0-r3, lr}`

```
#if defined(__ARM_FEATURE_PAC_DEFAULT)
        pop {r0-r3, r12, lr}
        aut r12, lr, sp
# else
        pop {r0, r3, lr}
# endif
        // __aeabi_cfcmple is in a different section for some builds.
        IT(ne)
        bne __aeabi_cfcmple
#if defined(USE_THUMB_2)
        mov r12, #APSR_C
        msr APSR_nzcvq, r12
#else
        msr APSR_nzcvq, #APSR_C
#endif
```

https://github.com/llvm/llvm-project/pull/142400