Convert &mut to & since the reference didn't need to be mutable

Author: Nashenas88

src/librustc_codegen_ssa/mir/analyze.rs

@@ -17,7 +17,7 @@ use super::FunctionCx;
 use crate::traits::*;
 
 pub fn non_ssa_locals<'a, 'b, 'c, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
-    fx: &mut FunctionCx<'a, 'b, 'tcx, Bx>,
+    fx: &FunctionCx<'a, 'b, 'tcx, Bx>,
     mir: &'c mut BodyCache<&'b Body<'tcx>>,
 ) -> BitSet<mir::Local> {
     let mut analyzer = LocalAnalyzer::new(fx, mir);

src/librustc_codegen_ssa/mir/mod.rs

@@ -174,7 +174,7 @@ pub fn codegen_mir<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
         per_local_var_debug_info: debuginfo::per_local_var_debug_info(cx.tcx(), mir),
     };
 
-    let memory_locals = analyze::non_ssa_locals(&mut fx, &mut mir);
+    let memory_locals = analyze::non_ssa_locals(&fx, &mut mir);
 
     // Allocate variable and temp allocas
     fx.locals = {