[Pkg-rust-maintainers] Bug#1071707: rustc: Add loong64 to the FAILURES_ALLOWED lists in d/rules

[zhangdandan]

Source: rustc
Version: 1.71.1+dfsg1-2
Severity: normal
Tags: patch
User: debian-loongarch at lists.debian.org
Usertags: loong64

Dear maintainers,

Compiling rustc 1.71 based on llvm-toolchain-16 failed in the Debian 
loong64 Package Auto-Building environment.
The error log is as follows,
```
......
error: could not find native static library 
`/usr/lib/llvm-16/lib/clang/16/lib/linux/libclang_rt.profile-loongarch64.a`, 
perhaps an -L flag is missing?
Did not run successfully: exit status: 1
......
```
The full build log can be found at 
https://buildd.debian.org/status/logs.php?pkg=rustc&ver=1.71.1%2Bdfsg1-2&arch=loong64.
Regarding the missing libclang_rt.profile-loongarch64.a file in the 
libclang-rt-16-dev package, our llvm team will add patches and commit 
bug for Debian llvm-toolchain-16.

Please note that Debian llvm support for loongarch is complete as of 
llvm-toolchain-17, for example,
```
root at localhost:/home# dpkg -c 
libclang-rt-16-dev_1%3a16.0.6-27_loong64.deb |grep 
libclang_rt.profile-loongarch64.a
root at localhost:/home#
root at localhost:/home# dpkg -c 
libclang-rt-17-dev_1%3a17.0.6-12_loong64.deb |grep 
libclang_rt.profile-loongarch64.a
-rw-r--r-- root/root    146744 2024-05-04 05:30 
./usr/lib/llvm-17/lib/clang/17/lib/linux/libclang_rt.profile-loongarch64.a
root at localhost:/home# dpkg -c 
libclang-rt-18-dev_1%3a18.1.6-1_loong64.deb |grep 
libclang_rt.profile-loongarch64.a
-rw-r--r-- root/root    150362 2024-05-19 07:27 
./usr/lib/llvm-18/lib/clang/18/lib/linux/libclang_rt.profile-loongarch64.a
```

Compiling rustc 1.71 based on llvm-toolchain-17 failed in our local 
loong64 ENV.
The error message is related to the number of failed test cases, for 
example,
```
......
Summary: exit code 1, counted 14 tests failed.
10 maximum allowed. Aborting the build.
......
```
We need to add loong64 to the FAILURES_ALLOWED lists in d/rules.
Please consider the patch (Signed-off-by: wangrui at loongson.cn) I attached.
Your opinions are welcome.

Thanks,
Dandan Zhang

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