[XCore] Change std::sort to llvm::sort in response to r327219

Summary:
r327219 added wrappers to std::sort which randomly shuffle the container before sorting.
This will help in uncovering non-determinism caused due to undefined sorting
order of objects having the same key.

To make use of that infrastructure we need to invoke llvm::sort instead of std::sort.

Note: This patch is one of a series of patches to replace *all* std::sort to llvm::sort.
Refer the comments section in D44363 for a list of all the required patches.

Reviewers: dblaikie, RKSimon, robertlytton

Reviewed By: robertlytton

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D44875

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@328564 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Mandeep Singh Grang

lib/Target/XCore/XCoreFrameLowering.cpp

@@ -151,7 +151,7 @@ static void GetSpillList(SmallVectorImpl<StackSlotInfo> &SpillList,
                                       Offset,
                                       FramePtr));
   }
-  std::sort(SpillList.begin(), SpillList.end(), CompareSSIOffset);
+  llvm::sort(SpillList.begin(), SpillList.end(), CompareSSIOffset);
 }
 
 /// Creates an ordered list of EH info register 'spills'.
@@ -170,7 +170,7 @@ static void GetEHSpillList(SmallVectorImpl<StackSlotInfo> &SpillList,
   SpillList.push_back(
       StackSlotInfo(EHSlot[0], MFI.getObjectOffset(EHSlot[1]),
                     TL->getExceptionSelectorRegister(PersonalityFn)));
-  std::sort(SpillList.begin(), SpillList.end(), CompareSSIOffset);
+  llvm::sort(SpillList.begin(), SpillList.end(), CompareSSIOffset);
 }
 
 static MachineMemOperand *getFrameIndexMMO(MachineBasicBlock &MBB,

lib/Target/XCore/XCoreLowerThreadLocal.cpp

@@ -129,7 +129,7 @@ createReplacementInstr(ConstantExpr *CE, Instruction *Instr) {
 static bool replaceConstantExprOp(ConstantExpr *CE, Pass *P) {
   do {
     SmallVector<WeakTrackingVH, 8> WUsers(CE->user_begin(), CE->user_end());
-    std::sort(WUsers.begin(), WUsers.end());
+    llvm::sort(WUsers.begin(), WUsers.end());
     WUsers.erase(std::unique(WUsers.begin(), WUsers.end()), WUsers.end());
     while (!WUsers.empty())
       if (WeakTrackingVH WU = WUsers.pop_back_val()) {