Rollup of 12 pull requests

[jieyouxu]

Successful merges:

• cg_gcc: Directly use rustc_abi instead of reexports #132547 (cg_gcc: Directly use rustc_abi instead of reexports)
• tests: Port split-debuginfo to rmake.rs #135572 (tests: Port split-debuginfo to rmake.rs)
• Make cenum_impl_drop_cast a hard error #135964 (Make cenum_impl_drop_cast a hard error)
• Use +secure-plt for powerpc-unknown-linux-gnu{,spe} #136154 (Use +secure-plt for powerpc-unknown-linux-gnu{,spe})
• Reject negative literals for unsigned or char types in pattern ranges and literals #136304 (Reject negative literals for unsigned or char types in pattern ranges and literals)
• uefi: process: Add support for command environment variables #136418 (uefi: process: Add support for command environment variables)
• std: move network code into sys #136449 (std: move network code into sys)
• implement inherent str constructors #136517 (implement inherent str constructors)
• Rename and Move some UI tests to more suitable subdirs #136536 (Rename and Move some UI tests to more suitable subdirs)
• Update compiler-builtins to 0.1.145 #136537 (Update compiler-builtins to 0.1.145)
• Rename slice::take... methods to split_off... #136555 (Rename slice::take... methods to split_off...)
• Arbitrary self types v2: recursion test #136567 (Arbitrary self types v2: recursion test)

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