Use llvm::stable_sort

While touching the code, simplify if feasible.

llvm-svn: 358996
diff --git a/llvm/utils/TableGen/AsmMatcherEmitter.cpp b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
index df089cb..1229b65 100644
--- a/llvm/utils/TableGen/AsmMatcherEmitter.cpp
+++ b/llvm/utils/TableGen/AsmMatcherEmitter.cpp
@@ -3131,10 +3131,10 @@
   // Sort the instruction table using the partial order on classes. We use
   // stable_sort to ensure that ambiguous instructions are still
   // deterministically ordered.
-  std::stable_sort(Info.Matchables.begin(), Info.Matchables.end(),
-                   [](const std::unique_ptr<MatchableInfo> &a,
-                      const std::unique_ptr<MatchableInfo> &b){
-                     return *a < *b;});
+  llvm::stable_sort(
+      Info.Matchables,
+      [](const std::unique_ptr<MatchableInfo> &a,
+         const std::unique_ptr<MatchableInfo> &b) { return *a < *b; });
 
 #ifdef EXPENSIVE_CHECKS
   // Verify that the table is sorted and operator < works transitively.
diff --git a/llvm/utils/TableGen/CodeGenRegisters.cpp b/llvm/utils/TableGen/CodeGenRegisters.cpp
index 7d8efbf..f87c6d6 100644
--- a/llvm/utils/TableGen/CodeGenRegisters.cpp
+++ b/llvm/utils/TableGen/CodeGenRegisters.cpp
@@ -2101,8 +2101,7 @@
   for (unsigned Idx = 0, EndIdx = RegUnitSets.size(); Idx != EndIdx; ++Idx)
     RegUnitSetOrder.push_back(Idx);
 
-  std::stable_sort(RegUnitSetOrder.begin(), RegUnitSetOrder.end(),
-                   [this](unsigned ID1, unsigned ID2) {
+  llvm::stable_sort(RegUnitSetOrder, [this](unsigned ID1, unsigned ID2) {
     return getRegPressureSet(ID1).Units.size() <
            getRegPressureSet(ID2).Units.size();
   });
diff --git a/llvm/utils/TableGen/GlobalISelEmitter.cpp b/llvm/utils/TableGen/GlobalISelEmitter.cpp
index 1e71d13..8395296 100644
--- a/llvm/utils/TableGen/GlobalISelEmitter.cpp
+++ b/llvm/utils/TableGen/GlobalISelEmitter.cpp
@@ -4501,8 +4501,7 @@
        << ", // " << Record->getName() << "\n";
   OS << "};\n\n";
 
-  std::stable_sort(Rules.begin(), Rules.end(), [&](const RuleMatcher &A,
-                                                   const RuleMatcher &B) {
+  llvm::stable_sort(Rules, [&](const RuleMatcher &A, const RuleMatcher &B) {
     int ScoreA = RuleMatcherScores[A.getRuleID()];
     int ScoreB = RuleMatcherScores[B.getRuleID()];
     if (ScoreA > ScoreB)
diff --git a/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp b/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
index f95b3bf..1077889 100644
--- a/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
+++ b/llvm/utils/TableGen/RISCVCompressInstEmitter.cpp
@@ -543,15 +543,15 @@
   // transformed to a C_ADD or a C_MV. When emitting 'uncompress()' function the
   // source and destination are flipped and the sort key needs to change
   // accordingly.
-  std::stable_sort(CompressPatterns.begin(), CompressPatterns.end(),
-                   [Compress](const CompressPat &LHS, const CompressPat &RHS) {
-                     if (Compress)
-                       return (LHS.Source.TheDef->getName().str() <
-                               RHS.Source.TheDef->getName().str());
-                     else
-                       return (LHS.Dest.TheDef->getName().str() <
-                               RHS.Dest.TheDef->getName().str());
-                   });
+  llvm::stable_sort(CompressPatterns,
+                    [Compress](const CompressPat &LHS, const CompressPat &RHS) {
+                      if (Compress)
+                        return (LHS.Source.TheDef->getName().str() <
+                                RHS.Source.TheDef->getName().str());
+                      else
+                        return (LHS.Dest.TheDef->getName().str() <
+                                RHS.Dest.TheDef->getName().str());
+                    });
 
   // A list of MCOperandPredicates for all operands in use, and the reverse map.
   std::vector<const Record *> MCOpPredicates;