Subzero: Add -Wshadow to the build.

src/IceCfg.cpp

Index: src/IceCfg.cpp
diff --git a/src/IceCfg.cpp b/src/IceCfg.cpp
index f7b1a8c6e0b99823230cf7263ba34521d5ada63f..bf7be51c1df74cc1921b86c1a347ec61780abb13 100644
--- a/src/IceCfg.cpp
+++ b/src/IceCfg.cpp
@@ -34,8 +34,8 @@ ArenaAllocator<> *getCurrentCfgAllocator() {
   return Cfg::getCurrentCfgAllocator();
 }
 
-Cfg::Cfg(GlobalContext *Ctx, uint32_t SequenceNumber)
-    : Ctx(Ctx), SequenceNumber(SequenceNumber),
+Cfg::Cfg(GlobalContext *MyCtx, uint32_t MySequenceNumber)
+    : Ctx(MyCtx), SequenceNumber(MySequenceNumber),
       VMask(Ctx->getFlags().getVerbose()), NextInstNumber(Inst::NumberInitial),
       Allocator(new ArenaAllocator<>()), Live(nullptr),
       Target(TargetLowering::createLowering(Ctx->getFlags().getTargetArch(),
@@ -567,7 +567,7 @@ void Cfg::emit() {
   IceString MangledName = getContext()->mangleName(getFunctionName());
   emitTextHeader(MangledName, Ctx, getAssembler<>());
   for (CfgNode *Node : Nodes)
-    Node->emit(this);
+    Node->emit();
   Str << "\n";
 }
 
@@ -576,7 +576,7 @@ void Cfg::emitIAS() {
   // The emitIAS() routines emit into the internal assembler buffer,
   // so there's no need to lock the streams.
   for (CfgNode *Node : Nodes)
-    Node->emitIAS(this);
+    Node->emitIAS();
 }
 
 // Dumps the IR with an optional introductory message.
@@ -620,7 +620,7 @@ void Cfg::dump(const IceString &Message) {
   }
   // Print each basic block
   for (CfgNode *Node : Nodes)
-    Node->dump(this);
+    Node->dump();
   if (isVerbose(IceV_Instructions))
     Str << "}\n";
 }