[mips] Always run the MipsOptimizePICCall pass.

Summary:
Remove this pass from addMachineSSAOptimization() and register it unconditionally in through addPreRegAlloc(). This pass is required for generating correct PIC calls.

Reviewers: sdardis

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D26036

llvm-svn: 285814

llvm/lib/Target/Mips/MipsTargetMachine.cpp

@@ -208,7 +208,6 @@ class MipsPassConfig : public TargetPassConfig {
 
   void addIRPasses() override;
   bool addInstSelector() override;
-  void addMachineSSAOptimization() override;
   void addPreEmitPass() override;
 
   void addPreRegAlloc() override;
@@ -237,14 +236,8 @@ bool MipsPassConfig::addInstSelector() {
   return false;
 }
 
-void MipsPassConfig::addMachineSSAOptimization() {
-  addPass(createMipsOptimizePICCallPass(getMipsTargetMachine()));
-  TargetPassConfig::addMachineSSAOptimization();
-}
-
 void MipsPassConfig::addPreRegAlloc() {
-  if (getOptLevel() == CodeGenOpt::None)
-    addPass(createMipsOptimizePICCallPass(getMipsTargetMachine()));
+  addPass(createMipsOptimizePICCallPass(getMipsTargetMachine()));
 }
 
 TargetIRAnalysis MipsTargetMachine::getTargetIRAnalysis() {