Add various forms of LDREX/STREX to ARM integrated assembler.

src/IceInstARM32.cpp

Index: src/IceInstARM32.cpp
diff --git a/src/IceInstARM32.cpp b/src/IceInstARM32.cpp
index 07b4429bd2841d9a7b11c2f4e878794c1dd7b2d9..ba12862bddf1f7d27f342734cf4188d20a4112fb 100644
--- a/src/IceInstARM32.cpp
+++ b/src/IceInstARM32.cpp
@@ -1181,6 +1181,17 @@ template <> void InstARM32Ldrex::emit(const Cfg *Func) const {
   getSrc(0)->emit(Func);
 }
 
+template <> void InstARM32Ldrex::emitIAS(const Cfg *Func) const {
+  assert(getSrcSize() == 1);
+  assert(getDest()->hasReg());
+  Variable *Dest = getDest();
+  assert(isScalarIntegerType(Dest->getType()));
+  auto *Asm = Func->getAssembler<ARM32::AssemblerARM32>();
+  Asm->ldrex(Dest, getSrc(0), getPredicate(), Func->getTarget());
+  if (Asm->needsTextFixup())
+    emitUsingTextFixup(Func);
+}
+
 template <InstARM32::InstKindARM32 K>
 void InstARM32TwoAddrGPR<K>::emitIAS(const Cfg *Func) const {
   emitUsingTextFixup(Func);
@@ -1582,6 +1593,16 @@ void InstARM32Strex::emit(const Cfg *Func) const {
   emitSources(Func);
 }
 
+void InstARM32Strex::emitIAS(const Cfg *Func) const {
+  assert(getSrcSize() == 2);
+  const Operand *Src0 = getSrc(0);
+  assert(isScalarIntegerType(Src0->getType()));
+  auto *Asm = Func->getAssembler<ARM32::AssemblerARM32>();
+  Asm->strex(Dest, Src0, getSrc(1), getPredicate(), Func->getTarget());
+  if (Asm->needsTextFixup())
+    emitUsingTextFixup(Func);
+}
+
 void InstARM32Strex::dump(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;