-Oh flag removed from IAR. Optimization set in GUI.

Author: sarahmarshy

tools/export/iar/__init__.py

@@ -101,6 +101,8 @@ def generate(self):
             flags['c_flags'].remove('--vla')
         if '--no_static_destruction' in flags['c_flags']:
             flags['c_flags'].remove('--no_static_destruction')
+        if '-Oh' in flags['c_flags']:
+            flags['c_flags'].remove('-Oh')
         ctx = {
             'name': self.project_name,
             'groups': self.iar_groups(self.format_src(srcs)),