Currently, when a 'soft-stop' is triggered due to debug_info overflow,
there is an additional check for Dwarf5 to verify if the dwo contains a
split_compile unit (CU). However, since split_type units (TUs) are
typically placed before CUs in debug_info for Dwarf5, if an overflow is
detected within a TU causing an early break, the logic incorrectly
assumes this DWO lacks a CU and triggers an error.
Since the overflowing DWO will be discarded anyway, this validation is
redundant. This patch tries to fix this by removing the CU check during
a soft-stop.
Before this patch：
```
llvm-dwp main.dwo -continue-on-cu-index-overflow=soft-stop -o main.dwp
warning: debug_info Section Contribution Offset overflow 4G. Previous Offset 4294967271, After overflow offset 38.
error: no compile unit found in file: main.dwo
```
After：
```bash
llvm-dwp main.dwo -continue-on-cu-index-overflow=soft-stop -o main.dwp
warning: debug_info Section Contribution Offset overflow 4G. Previous Offset 4294967271, After overflow offset 38.
```
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