Supress warnings during the autotuner run

Warnings can be emitted during range inference or compilation which are
called for each candidate in the autotuning run.  The source TC
remaining the same, this crease an unnecessary stream of duplicate
warnings while the autotuning runs.  Use the newly introduced
CompilerOptions mechanism to disable warnings during the autotuning
process.  Note that this process returns the mapping options rather than
a compiled object, forcing the caller to explicitly compile with these
options and get the warnings if necessary.

Author: ftynse

tc/autotuner/autotuner-inl.h

@@ -29,6 +29,7 @@
 #include "tc/core/tensor.h"
 #include "tc/core/utils/math.h"
 #include "tc/lang/canonicalize.h"
+#include "tc/utils/compiler_options.h"
 
 namespace tc {
 namespace autotune {
@@ -74,6 +75,9 @@ void TuningHarness<Backend>::stopAfterCurrentIteration() {
 template <typename Backend>
 template <typename SearchStrategy>
 void TuningHarness<Backend>::doCompile(SearchStrategy& searchStrategy) {
+  CompilerOptions supressWarningsOptions;
+  supressWarningsOptions.emitWarnings = false;
+
   // Atomically fetch and add the next job until there are no jobs left
   while (true) {
     auto current = currentCompilationJob_.fetch_add(1);
@@ -93,7 +97,7 @@ void TuningHarness<Backend>::doCompile(SearchStrategy& searchStrategy) {
           LOG_LINE_BY_LINE(INFO, ssInfo);
         }
         pExecutor = tc::detail::compile<Backend>(
-            tcTree_, inputs_.begin()->second, options);
+            tcTree_, inputs_.begin()->second, options, supressWarningsOptions);
         LOG_IF(INFO, FLAGS_debug_tuner) << "[COMPILE] Done compilation";
       } catch (const std::exception& e) {
         LOG(WARNING) << "[TUNER][COMPILE] failed compilation: " << e.what();