[gardening] Change a function with 4 space indent => 2 space indent and standardize variable names.

NFC.

Author: gottesmm

lib/SILOptimizer/Mandatory/ClosureLifetimeFixup.cpp

@@ -33,37 +33,37 @@ llvm::cl::opt<bool> DisableConvertEscapeToNoEscapeSwitchEnumPeephole(
 
 using namespace swift;
 
-static SILBasicBlock *getOptionalDiamondSuccessor(SwitchEnumInst *SEI) {
-   auto numSuccs = SEI->getNumSuccessors();
-   if (numSuccs != 2)
-     return nullptr;
-   auto *SuccSome = SEI->getCase(0).second;
-   auto *SuccNone = SEI->getCase(1).second;
-   if (SuccSome->args_size() != 1)
-     std::swap(SuccSome, SuccNone);
+static SILBasicBlock *getOptionalDiamondSuccessor(SwitchEnumInst *sei) {
+  auto numSuccs = sei->getNumSuccessors();
+  if (numSuccs != 2)
+    return nullptr;
+  auto *succSome = sei->getCase(0).second;
+  auto *succNone = sei->getCase(1).second;
+  if (succSome->args_size() != 1)
+    std::swap(succSome, succNone);
 
-   if (SuccSome->args_size() != 1 || SuccNone->args_size() != 0)
-     return nullptr;
+  if (succSome->args_size() != 1 || succNone->args_size() != 0)
+    return nullptr;
 
-   auto *Succ = SuccSome->getSingleSuccessorBlock();
-   if (!Succ)
-     return nullptr;
+  auto *succ = succSome->getSingleSuccessorBlock();
+  if (!succ)
+    return nullptr;
 
-   if (SuccNone == Succ)
-     return Succ;
+  if (succNone == succ)
+    return succ;
 
-   SuccNone = SuccNone->getSingleSuccessorBlock();
-   if (SuccNone == Succ)
-     return Succ;
+  succNone = succNone->getSingleSuccessorBlock();
+  if (succNone == succ)
+    return succ;
 
-   if (SuccNone == nullptr)
-     return nullptr;
+  if (succNone == nullptr)
+    return nullptr;
 
-   SuccNone = SuccNone->getSingleSuccessorBlock();
-   if (SuccNone == Succ)
-     return Succ;
+  succNone = succNone->getSingleSuccessorBlock();
+  if (succNone == succ)
+    return succ;
 
-   return nullptr;
+  return nullptr;
 }
 
 /// Find a safe insertion point for closure destruction. We might create a