Add timers for branch relaxation and instruction shrinking.

lib/codegen/src/binemit/relaxation.rs

@@ -32,12 +32,15 @@ use cursor::{Cursor, FuncCursor};
 use ir::{Function, InstructionData, Opcode};
 use isa::{EncInfo, TargetIsa};
 use iterators::IteratorExtras;
+use timing;
 use CodegenResult;
 
 /// Relax branches and compute the final layout of EBB headers in `func`.
 ///
 /// Fill in the `func.offsets` table so the function is ready for binary emission.
 pub fn relax_branches(func: &mut Function, isa: &TargetIsa) -> CodegenResult<CodeOffset> {
+    let _tt = timing::relax_branches();
+
     let encinfo = isa.encoding_info();
 
     // Clear all offsets so we can recognize EBBs that haven't been visited yet.

lib/codegen/src/binemit/shrink.rs

@@ -8,9 +8,12 @@
 use ir::Function;
 use isa::TargetIsa;
 use regalloc::RegDiversions;
+use timing;
 
 /// Pick the smallest valid encodings for instructions.
 pub fn shrink_instructions(func: &mut Function, isa: &TargetIsa) {
+    let _tt = timing::shrink_instructions();
+
     let encinfo = isa.encoding_info();
     let mut divert = RegDiversions::new();