This patch addresses compatibility issues with the lit internal shell by
expanding and rewriting test scripts in the compiler-rt subproject.
These changes were prompted by the FileNotFound unresolved errors
encountered during the testing process, specifically when running the
command `LIT_USE_INTERNAL_SHELL=1 ninja check compiler-rt`.
**Why the error occurred:**
The error occurred because the original test scripts used process
substitution `(<(...))` in their diff commands. Process substitution
creates temporary files or FIFOs to hold command output, and these are
then passed to `diff`. However, the lit internal shell, which is more
limited than a typical shell like `bash`, does not support process
substitution. When lit tries to execute these commands, it is unable to
create or access the temporary files or FIFOs generated by process
substitution. As a result, lit attempts to open a file or directory that
doesn't exist, leading to the `FileNotFoundError`.
**Changes Made:**
- Instead of using process substitution, the commands now explicitly
redirect the output of `llvm-profdata show` to temporary files before
performing the `diff` comparison. This ensures that the lit internal
shell can correctly find and open these files, resolving the
`FileNotFoundError`.
[This change is relevant [RFC] Enabling the lit internal shell by
Default](https://discourse.llvm.org/t/rfc-enabling-the-lit-internal-shell-by-default/80179)
fixes: #106111
823e942998