[EXPERIMENT 8] Pin compiler cc @ 1.2.21

Author: jieyouxu

Cargo.lock

@@ -462,9 +462,9 @@ version = "0.1.0"
 
 [[package]]
 name = "cc"
-version = "1.2.22"
+version = "1.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32db95edf998450acc7881c932f94cd9b05c87b4b2599e8bab064753da4acfd1"
+checksum = "8691782945451c1c383942c4874dbe63814f61cb57ef773cda2972682b7bb3c0"
 dependencies = [
  "jobserver",
  "libc",

compiler/rustc_llvm/Cargo.toml

@@ -11,7 +11,7 @@ libc = "0.2.73"
 [build-dependencies]
 # tidy-alphabetical-start
 # `cc` updates often break things, so we pin it here.
-cc = "=1.2.22"
+cc = "=1.2.21"
 # tidy-alphabetical-end
 
 [features]