Start adding an integrated assembler.

src/llvm2ice.cpp

Index: src/llvm2ice.cpp
diff --git a/src/llvm2ice.cpp b/src/llvm2ice.cpp
index ce700b7556bce165651b292aed7f6fc3625c3586..ea83b2ca0b48b3d11e05bf49a16b6393e57fbc0b 100644
--- a/src/llvm2ice.cpp
+++ b/src/llvm2ice.cpp
@@ -125,6 +125,10 @@ static cl::opt<bool>
 BuildOnRead("build-on-read",
             cl::desc("Build ICE instructions when reading bitcode"),
             cl::init(false));
+static cl::opt<bool>
+    UseIntegratedAssembler("integrated-as",
+                           cl::desc("Use integrated assembler (default yes)"),
+                           cl::init(true));
 
 int main(int argc, char **argv) {
 
@@ -154,6 +158,7 @@ int main(int argc, char **argv) {
   Flags.DisableTranslation = DisableTranslation;
   Flags.DisableGlobals = DisableGlobals;
   Flags.FunctionSections = FunctionSections;
+  Flags.UseIntegratedAssembler = UseIntegratedAssembler;
   Flags.UseSandboxing = UseSandboxing;
   Flags.DefaultGlobalPrefix = DefaultGlobalPrefix;
   Flags.DefaultFunctionPrefix = DefaultFunctionPrefix;