eliminate code related to --no-ir-gen

src/IceCompiler.cpp

Index: src/IceCompiler.cpp
diff --git a/src/IceCompiler.cpp b/src/IceCompiler.cpp
index 82f99a917c02e8fcab4fa037442e766dca309cd7..2d70b6641800227e2f50b47b5543e2973d4f5dfa 100644
--- a/src/IceCompiler.cpp
+++ b/src/IceCompiler.cpp
@@ -47,7 +47,6 @@ struct {
   int FlagValue;
 } ConditionalBuildAttributes[] = {
     {"dump", BuildDefs::dump()},
-    {"disable_ir_gen", BuildDefs::disableIrGen()},
     {"llvm_cl", BuildDefs::llvmCl()},
     {"llvm_ir", BuildDefs::llvmIr()},
     {"llvm_ir_as_input", BuildDefs::llvmIrAsInput()},
@@ -95,12 +94,6 @@ void Compiler::run(const Ice::ClFlagsExtra &ExtraFlags, GlobalContext &Ctx,
   if (ExtraFlags.getGenerateBuildAtts())
     return Ctx.getErrorStatus()->assign(EC_None);
 
-  if (!BuildDefs::disableIrGen() && Ctx.getFlags().getDisableIRGeneration()) {
-    Ctx.getStrError() << "Error: Build doesn't allow --no-ir-gen when not "
-                      << "ALLOW_DISABLE_IR_GEN!\n";
-    return Ctx.getErrorStatus()->assign(EC_Args);
-  }
-
   // The Minimal build (specifically, when dump()/emit() are not implemented)
   // allows only --filetype=obj. Check here to avoid cryptic error messages
   // downstream.