Update to the rustfmt in rust 1.27, which is now stable. (#377)

lib/codegen/src/ir/function.rs

@@ -7,8 +7,10 @@ use binemit::CodeOffset;
 use entity::{EntityMap, PrimaryMap};
 use ir;
 use ir::{DataFlowGraph, ExternalName, Layout, Signature};
-use ir::{Ebb, ExtFuncData, FuncRef, GlobalValue, GlobalValueData, Heap, HeapData, JumpTable,
-         JumpTableData, SigRef, StackSlot, StackSlotData};
+use ir::{
+    Ebb, ExtFuncData, FuncRef, GlobalValue, GlobalValueData, Heap, HeapData, JumpTable,
+    JumpTableData, SigRef, StackSlot, StackSlotData,
+};
 use ir::{EbbOffsets, InstEncodings, JumpTables, SourceLocs, StackSlots, ValueLocations};
 use isa::{EncInfo, Encoding, Legalize, TargetIsa};
 use settings::CallConv;

lib/codegen/src/ir/libcall.rs

@@ -1,7 +1,9 @@
 //! Naming well-known routines in the runtime library.
 
-use ir::{types, AbiParam, ArgumentPurpose, ExtFuncData, ExternalName, FuncRef, Function, Inst,
-         Opcode, Signature, Type};
+use ir::{
+    types, AbiParam, ArgumentPurpose, ExtFuncData, ExternalName, FuncRef, Function, Inst, Opcode,
+    Signature, Type,
+};
 use isa::{RegUnit, TargetIsa};
 use settings::CallConv;
 use std::fmt;

lib/codegen/src/ir/mod.rs

@@ -24,7 +24,9 @@ mod valueloc;
 
 pub use ir::builder::{InsertBuilder, InstBuilder, InstBuilderBase, InstInserterBase};
 pub use ir::dfg::{DataFlowGraph, ValueDef};
-pub use ir::entities::{Ebb, FuncRef, GlobalValue, Heap, Inst, JumpTable, SigRef, StackSlot, Value};
+pub use ir::entities::{
+    Ebb, FuncRef, GlobalValue, Heap, Inst, JumpTable, SigRef, StackSlot, Value,
+};
 pub use ir::extfunc::{AbiParam, ArgumentExtension, ArgumentPurpose, ExtFuncData, Signature};
 pub use ir::extname::ExternalName;
 pub use ir::function::Function;