Commits on Jan 19, 2020

1. Add -Wl,-znotext to default linker flags to link with lld 9 on FreeBS… …

   …D 13.0-CURRENT i386
   
   rust-nightly has been failing to link since 2019-12-10 with variations of
   ```
    = note: ld: error: relocation R_386_PC32 cannot be used against symbol __rust_probestack; recompile with -fPIC
             >>> defined in /wrkdirs/usr/ports/lang/rust-nightly/work/rustc-nightly-src/build/i686-unknown-freebsd/stage1/lib/rustlib/i686-unknown-freebsd/lib/libcompiler_builtins-6570a75fe85f0e1a.rlib(compiler_builtins-6570a75fe85f0e1a.compiler_builtins.2i519eqi-cgu.15.rcgu.o)
             >>> referenced by std.4xivr03c-cgu.14
             >>>               std-9bd70afd58e204b7.std.4xivr03c-cgu.14.rcgu.o:(_$LT$alloc..boxed..Box$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::h1c78ed6e734a2bfc (.llvm.10122419023709863394)) in archive /wrkdirs/usr/ports/lang/rust-nightly/work/rustc-nightly-src/build/i686-unknown-freebsd/stage1/lib/rustlib/i686-unknown-freebsd/lib/libstd-9bd70afd58e204b7.rlib
   
             ld: error: relocation R_386_PC32 cannot be used against symbol __rust_probestack; recompile with -fPIC
             >>> defined in /wrkdirs/usr/ports/lang/rust-nightly/work/rustc-nightly-src/build/i686-unknown-freebsd/stage1/lib/rustlib/i686-unknown-freebsd/lib/libcompiler_builtins-6570a75fe85f0e1a.rlib(compiler_builtins-6570a75fe85f0e1a.compiler_builtins.2i519eqi-cgu.15.rcgu.o)
             >>> referenced by std.4xivr03c-cgu.14
             >>>               std-9bd70afd58e204b7.std.4xivr03c-cgu.14.rcgu.o:(std::io::util::copy::h9115f048f2203467) in archive /wrkdirs/usr/ports/lang/rust-nightly/work/rustc-nightly-src/build/i686-unknown-freebsd/stage1/lib/rustlib/i686-unknown-freebsd/lib/libstd-9bd70afd58e204b7.rlib
             clang-cpp: error: linker command failed with exit code 1 (use -v to see invocation)
   
   error: aborting due to previous error
   
   error: could not compile `rustc_macros`.
   ```
   Full log: http://beefy17.nyi.freebsd.org/data/head-i386-default/p523508_s356869/logs/rust-nightly-1.42.0.20200118.log
   
   AFAICT it stopped building after bumping compiler_builtins to 0.1.22
   in #67110.

   Tobias Kortkamp committed Jan 19, 2020
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