Mention me (@WaffleLapkin) when changes to rustc_codegen_ssa occur

Author: WaffleLapkin

triagebot.toml

@@ -701,6 +701,9 @@ cc = ["@davidtwco", "@wesleywiser"]
 [mentions."compiler/rustc_codegen_cranelift"]
 cc = ["@bjorn3"]
 
+[mentions."compiler/rustc_codegen_ssa"]
+cc = ["@WaffleLapkin"]
+
 [mentions."compiler/rustc_codegen_gcc"]
 cc = ["@antoyo", "@GuillaumeGomez"]