cleanup

Author: xacrimon

compiler/rustc_codegen_gcc/src/builder.rs

@@ -1756,7 +1756,6 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
     }
 
     fn set_tail_call(&mut self, _call_inst: RValue<'gcc>) {
-        // Explicitly fail when this method is called
         bug!(
             "Guaranteed tail calls with the 'become' keyword are not implemented in the GCC backend"
         );

compiler/rustc_codegen_llvm/src/builder.rs

@@ -1373,7 +1373,6 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> {
     }
 
     fn set_tail_call(&mut self, call_inst: &'ll Value) {
-        // Use musttail for guaranteed tail call optimization required by 'become'
         llvm::LLVMRustSetTailCallKind(call_inst, llvm::TailCallKind::MustTail);
     }
 }