Make iree::main static (#20227)

Follow up to
#20223 (comment)

Signed-off-by: Ivan Butygin <[email protected]>

Author: Hardcode84

tools/iree-check-module-main.cc

@@ -147,7 +147,7 @@ iree_status_t Run(iree_allocator_t host_allocator, int* out_exit_code) {
 
 }  // namespace
 
-int main(int argc, char** argv) {
+static int main(int argc, char** argv) {
   IREE_TRACE_APP_ENTER();
 
   // Pass through flags to gtest (allowing --help to fall through).

tools/iree-run-mlir-main.cc

@@ -452,7 +452,7 @@ class ArgParser {
 
 }  // namespace
 
-int main(int argc, char** argv) {
+static int main(int argc, char** argv) {
   IREE_TRACE_APP_ENTER();
   IREE_TRACE_ZONE_BEGIN_NAMED(z0, "iree-run-mlir");