Auto merge of #113391 - fee1-dead-contrib:rollup-9bqlw9z, r=fee1-dead

Rollup of 9 pull requests

Successful merges:

 - #111119 (style-guide: Add chapter about formatting for nightly-only syntax)
 - #112791 (llvm ffi: Expose `CallInst->setTailCallKind`)
 - #113145 (style-guide: Document newline rules for assignment operators)
 - #113163 (Add a regression test for #112895)
 - #113332 (resolve: Use `Interned` for some interned structures)
 - #113334 (Revert the lexing of `c"…"` string literals)
 - #113350 (Fix the issue of wrong diagnosis for extern pub fn)
 - #113371 (Fix submodule handling when the current branch is named after a tag)
 - #113384 (style-guide: Clarify grammar for small patterns (not a semantic change))

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Cargo.lock

@@ -766,6 +766,16 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "cstr"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c11a39d776a3b35896711da8a04dc1835169dcd36f710878187637314e47941b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+]
+
 [[package]]
 name = "ctrlc"
 version = "3.4.0"
@@ -3016,6 +3026,7 @@ name = "rustc_codegen_llvm"
 version = "0.0.0"
 dependencies = [
  "bitflags 1.3.2",
+ "cstr",
  "libc",
  "measureme",
  "object",

compiler/rustc_codegen_llvm/Cargo.toml

@@ -8,6 +8,7 @@ test = false
 
 [dependencies]
 bitflags = "1.0"
+cstr = "0.2"
 libc = "0.2"
 measureme = "10.0.0"
 object = { version = "0.31.1", default-features = false, features = [