[clang] [Static analysis] Encodes a filename before inserting it into a URL. (PR #120123)

[LLVM Continuous Integration via cfe-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 `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/174/builds/10204

<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 'Clang :: Analysis/scan-build/deduplication.test' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 3
rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/Analysis/scan-build/Output/deduplication.test.tmp.output_dir && mkdir /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/Analysis/scan-build/Output/deduplication.test.tmp.output_dir
# executed command: rm -rf /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/Analysis/scan-build/Output/deduplication.test.tmp.output_dir
# executed command: mkdir /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/Analysis/scan-build/Output/deduplication.test.tmp.output_dir
# RUN: at line 4
'/usr/bin/perl' '/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/tools/scan-build/bin/scan-build' --use-analyzer=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang-20  -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/Analysis/scan-build/Output/deduplication.test.tmp.output_dir              /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang -S /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/Inputs/deduplication/1.c                        /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/Inputs/deduplication/2.c      | /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/deduplication.test -check-prefix CHECK-STDOUT
# executed command: /usr/bin/perl /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/tools/scan-build/bin/scan-build --use-analyzer=/home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang-20 -o /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/tools/clang/test/Analysis/scan-build/Output/deduplication.test.tmp.output_dir /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/clang -S /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/Inputs/deduplication/1.c /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/Inputs/deduplication/2.c
# .---command stderr------------
# | Can't locate URI/Escape.pm in @INC (you may need to install the URI::Escape module) (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 /usr/lib/x86_64-linux-gnu/perl5/5.30 /usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl/5.30 /usr/share/perl/5.30 /usr/local/lib/site_perl /usr/lib/x86_64-linux-gnu/perl-base) at /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/tools/scan-build/bin/scan-build line 26.
# | BEGIN failed--compilation aborted at /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/tools/scan-build/bin/scan-build line 26.
# `-----------------------------
# error: command failed with exit status: 2
# executed command: /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/deduplication.test -check-prefix CHECK-STDOUT
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/build/bin/FileCheck /home/buildbot/buildbot-root/llvm-clang-x86_64-gcc-ubuntu/llvm-project/clang/test/Analysis/scan-build/deduplication.test -check-prefix CHECK-STDOUT
# `-----------------------------
# error: command failed with exit status: 2

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/120123