squash warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61707 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SelectionDAG/SelectionDAGBuild.cpp

@@ -2019,6 +2019,7 @@ void SelectionDAGLowering::visitSwitch(SwitchInst &SI) {
   size_t numCmps = Clusterify(Cases, SI);
   DEBUG(errs() << "Clusterify finished. Total clusters: " << Cases.size()
                << ". Total compares: " << numCmps << '\n');
+  numCmps = 0;
 
   // Get the Value to be switched on and default basic blocks, which will be
   // inserted into CaseBlock records, representing basic blocks in the binary

lib/CodeGen/SimpleRegisterCoalescing.cpp

@@ -1662,7 +1662,7 @@ bool SimpleRegisterCoalescing::SimpleJoin(LiveInterval &LHS, LiveInterval &RHS){
   // optimize for it: if there is more than one value, we merge them all into
   // the lowest numbered one, then handle the interval as if we were merging
   // with one value number.
-  VNInfo *LHSValNo;
+  VNInfo *LHSValNo = NULL;
   if (EliminatedLHSVals.size() > 1) {
     // Loop through all the equal value numbers merging them into the smallest
     // one.

lib/Target/DarwinTargetAsmInfo.cpp

@@ -108,6 +108,7 @@ DarwinTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
   }
 
   // FIXME: Do we have any extra special weird cases?
+  return NULL;
 }
 
 const Section*

lib/Target/ELFTargetAsmInfo.cpp

@@ -86,6 +86,8 @@ ELFTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
     }
   } else
     assert(0 && "Unsupported global");
+
+  return NULL;
 }
 
 const Section*

lib/Target/TargetAsmInfo.cpp

@@ -342,6 +342,7 @@ TargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
    default:
     assert(0 && "Unknown section kind");
   }
+  return NULL;
 }
 
 const Section*

lib/Target/X86/X86ISelLowering.cpp

@@ -1255,7 +1255,7 @@ X86TargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG) {
     
     if (VA.isRegLoc()) {
       MVT RegVT = VA.getLocVT();
-      TargetRegisterClass *RC;
+      TargetRegisterClass *RC = NULL;
       if (RegVT == MVT::i32)
         RC = X86::GR32RegisterClass;
       else if (Is64Bit && RegVT == MVT::i64)

lib/Target/X86/X86TargetAsmInfo.cpp

@@ -319,6 +319,7 @@ X86COFFTargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
    default:
     assert(0 && "Unknown section kind");
   }
+  return NULL;
 }
 
 std::string X86COFFTargetAsmInfo::printSectionFlags(unsigned flags) const {