Auto merge of #85961 - 1000teslas:issue-71519-fix, r=petrochenkov

MVP for using rust-lld as part of cc

Will fix #71519. I need to figure out how to write a test showing that lld is used instead of whatever linker cc normally uses. When I manually run rustc using `echo 'fn main() {}' | RUSTC_LOG=rustc_codegen_ssa:🔙:link=debug ./rustc -Clinker-flavor=gcc-lld --crate-type bin -Clink-arg=-Wl,-v` (thanks to bjorn3 on Zulip), I can see that lld is used, but I'm not sure how to inspect that output in a test.

src/test/run-make/issue-71519/Makefile

@@ -0,0 +1,6 @@
+-include ../../run-make-fulldeps/tools.mk
+
+# needs-rust-lld
+all:
+	RUSTC_LOG=rustc_codegen_ssa::back::link=info $(RUSTC) -Z gcc-ld=lld -C link-args=-Wl,-v main.rs 2> $(TMPDIR)/output.txt
+	$(CGREP) -e "^LLD [0-9]+\.[0-9]+\.[0-9]+" < $(TMPDIR)/output.txt

src/test/run-make/issue-71519/main.rs

@@ -0,0 +1,4 @@
+// test linking using cc with rust-lld injected into search path as ld
+// see rust-lang/rust#71519 for more info
+
+fn main() {}