Fix CPU mapping options printing

operator<< was missing for CpuMappingOptions, add it

Author: nicolasvasilache

tc/core/cpu/cpu_mapping_options.cc

@@ -78,4 +78,12 @@ CpuMappingOptions CpuMappingOptions::makeNaiveMappingOptions() {
   return makeUnmappedMappingOptions().tile(32, 32, 32).unroll(1);
 }
 
+std::ostream& operator<<(
+    std::ostream& os,
+    const CpuMappingOptions& cpuOptions) {
+  OstreamBoolalphaScope scope(os);
+  tc::CpuMappingOptionsAsCpp cpp(cpuOptions);
+  os << cpp;
+  return os;
+}
 } // namespace tc

tc/core/cpu/cpu_mapping_options.h

@@ -79,4 +79,7 @@ class CpuMappingOptions {
  public:
   MappingOptionsView generic;
 };
+
+std::ostream& operator<<(std::ostream& os, const CpuMappingOptions& view);
+
 } // namespace tc