Rollup of 5 pull requests

[Urgau]

Successful merges:

• Windows: remove readonly files #134679 (Windows: remove readonly files)
• Fuchsia: Allow Rust to use a number of libc filesystem calls #136213 (Allow Rust to use a number of libc filesystem calls)
• Implement x perf directly in bootstrap #136530 (Implement x perf directly in bootstrap)
• Detect (non-raw) borrows of null ZST pointers in CheckNull #136601 (Detect (non-raw) borrows of null ZST pointers in CheckNull)
• Pick the max DWARF version when LTO'ing modules with different versions  #136659 (Pick the max DWARF version when LTO'ing modules with different versions )

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