[X86] In X86DomainReassignment.cpp add enclosed registers to EnclosedEdges

[Carrot]

Summary

The variable X86DomainReassignment::EnclosedEdges is used to store registers that have been enclosed in some closure, so those registers will be ignored when create new closures. But there is no registers has ever been put into this set, so a single register can be enclosed in multiple closures, it significantly increase compile time.

This patch adds a register into EnclosedEdges when it is enclosed into a closure.

[Carrot]

ping

[craig.topper]

LGTM

llvm/trunk/lib/Target/X86/X86DomainReassignment.cpp

void X86DomainReassignment::buildClosure(Closure &C, unsigned Reg) {
   RegDomain Domain = NoDomain;
   visitRegister(C, Reg, Domain, Worklist);
   while (!Worklist.empty()) {
     unsigned CurReg = Worklist.pop_back_val();
 
     // Register already in this closure.
     if (!C.insertEdge(CurReg))
       continue;
+    EnclosedEdges.insert(Reg);
 
     MachineInstr *DefMI = MRI->getVRegDef(CurReg);
     encloseInstr(C, DefMI);
 
     // Add register used by the defining MI to the worklist.
     // Do not add registers which are used in address calculation, they will be
     // added to a different closure.
     int OpEnd = DefMI->getNumOperands();