Align also IAR - develop profile to be size optimized

IAR is also performance optimizing instead of size optimizing in
develop profile. Align also that (review feedback).

Author: Janne Kiiskila

tools/profiles/develop.json

@@ -49,7 +49,7 @@
     "IAR": {
         "common": [
             "--no_wrap_diagnostics", "-e",
-            "--diag_suppress=Pa050,Pa084,Pa093,Pa082", "-Oh", "--enable_restrict",
+            "--diag_suppress=Pa050,Pa084,Pa093,Pa082", "-Ohz", "--enable_restrict",
              "-DMBED_TRAP_ERRORS_ENABLED=1"],
         "asm": [],
         "c": ["--vla", "--diag_suppress=Pe546"],