diff --git a/Makefile.rules b/Makefile.rules
index 5fc77a5e510..7ffb7bf4332 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -376,7 +376,7 @@ ifeq ($(HOST_OS),MingW)
   endif
 endif
 
-CXX.Flags     += -Woverloaded-virtual
+CXX.Flags     += -Woverloaded-virtual -Wuninitialized-experimental
 CPP.BaseFlags += $(CPP.Defines)
 AR.Flags      := cru
 
@@ -1528,31 +1528,31 @@ BC_DEPEND_MOVEFILE = then $(MV) -f "$(ObjDir)/$*.bc.d.tmp" "$(ObjDir)/$*.bc.d";
 $(ObjDir)/%.ll: %.cpp $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCXX)
 	$(Echo) "Compiling $*.cpp for $(BuildMode) build (bytecode)"
 	$(Verb) if $(BCCompile.CXX) $(BC_DEPEND_OPTIONS) \
-			$< -o $(ObjDir)/$*.ll -S -$(LLVMCC_EMITIR_FLAG) ; \
+			$< -o $(ObjDir)/$*.ll -S $(LLVMCC_EMITIR_FLAG) ; \
 	        $(BC_DEPEND_MOVEFILE)
 
 $(ObjDir)/%.ll: %.mm $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCXX)
 	$(Echo) "Compiling $*.mm for $(BuildMode) build (bytecode)"
 	$(Verb) if $(BCCompile.CXX) $(BC_DEPEND_OPTIONS) \
-			$< -o $(ObjDir)/$*.ll -S -$(LLVMCC_EMITIR_FLAG) ; \
+			$< -o $(ObjDir)/$*.ll -S $(LLVMCC_EMITIR_FLAG) ; \
 	        $(BC_DEPEND_MOVEFILE)
 
 $(ObjDir)/%.ll: %.cc $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCXX)
 	$(Echo) "Compiling $*.cc for $(BuildMode) build (bytecode)"
 	$(Verb) if $(BCCompile.CXX) $(BC_DEPEND_OPTIONS) \
-			$< -o $(ObjDir)/$*.ll -S -$(LLVMCC_EMITIR_FLAG) ; \
+			$< -o $(ObjDir)/$*.ll -S $(LLVMCC_EMITIR_FLAG) ; \
 	        $(BC_DEPEND_MOVEFILE)
 
 $(ObjDir)/%.ll: %.c $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCC)
 	$(Echo) "Compiling $*.c for $(BuildMode) build (bytecode)"
 	$(Verb) if $(BCCompile.C) $(BC_DEPEND_OPTIONS) \
-			$< -o $(ObjDir)/$*.ll -S -$(LLVMCC_EMITIR_FLAG) ; \
+			$< -o $(ObjDir)/$*.ll -S $(LLVMCC_EMITIR_FLAG) ; \
 	        $(BC_DEPEND_MOVEFILE)
 
 $(ObjDir)/%.ll: %.m $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCC)
 	$(Echo) "Compiling $*.m for $(BuildMode) build (bytecode)"
 	$(Verb) if $(BCCompile.C) $(BC_DEPEND_OPTIONS) \
-			$< -o $(ObjDir)/$*.ll -S -$(LLVMCC_EMITIR_FLAG) ; \
+			$< -o $(ObjDir)/$*.ll -S $(LLVMCC_EMITIR_FLAG) ; \
 	        $(BC_DEPEND_MOVEFILE)
 
 # Provide alternate rule sets if dependencies are disabled
@@ -1580,23 +1580,23 @@ $(ObjDir)/%.o: %.m $(ObjDir)/.dir $(BUILT_SOURCES)
 
 $(ObjDir)/%.ll: %.cpp $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCXX)
 	$(Echo) "Compiling $*.cpp for $(BuildMode) build (bytecode)"
-	$(BCCompile.CXX) $< -o $@ -S -$(LLVMCC_EMITIR_FLAG)
+	$(BCCompile.CXX) $< -o $@ -S $(LLVMCC_EMITIR_FLAG)
 
 $(ObjDir)/%.ll: %.mm $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCXX)
 	$(Echo) "Compiling $*.mm for $(BuildMode) build (bytecode)"
-	$(BCCompile.CXX) $< -o $@ -S -$(LLVMCC_EMITIR_FLAG)
+	$(BCCompile.CXX) $< -o $@ -S $(LLVMCC_EMITIR_FLAG)
 
 $(ObjDir)/%.ll: %.cc $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCXX)
 	$(Echo) "Compiling $*.cc for $(BuildMode) build (bytecode)"
-	$(BCCompile.CXX) $< -o $@ -S -$(LLVMCC_EMITIR_FLAG)
+	$(BCCompile.CXX) $< -o $@ -S $(LLVMCC_EMITIR_FLAG)
 
 $(ObjDir)/%.ll: %.c $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCC)
 	$(Echo) "Compiling $*.c for $(BuildMode) build (bytecode)"
-	$(BCCompile.C) $< -o $@ -S -$(LLVMCC_EMITIR_FLAG)
+	$(BCCompile.C) $< -o $@ -S $(LLVMCC_EMITIR_FLAG)
 
 $(ObjDir)/%.ll: %.m $(ObjDir)/.dir $(BUILT_SOURCES) $(LLVMCC)
 	$(Echo) "Compiling $*.m for $(BuildMode) build (bytecode)"
-	$(BCCompile.C) $< -o $@ -S -$(LLVMCC_EMITIR_FLAG)
+	$(BCCompile.C) $< -o $@ -S $(LLVMCC_EMITIR_FLAG)
 
 endif
 
diff --git a/include/llvm/Analysis/AliasSetTracker.h b/include/llvm/Analysis/AliasSetTracker.h
index e844d10dda0..4efa3963b66 100644
--- a/include/llvm/Analysis/AliasSetTracker.h
+++ b/include/llvm/Analysis/AliasSetTracker.h
@@ -259,6 +259,7 @@ private:
       if (CallSites[i] == CS.getInstruction()) {
         CallSites[i] = CallSites.back();
         CallSites.pop_back();
+        --i; --e;  // Revisit the moved entry.
       }
   }
   void setVolatile() { Volatile = true; }