Make these typechecker tests run in the optimised way too

The coercion optimiser is stressed by optimisation.
I don't think this will slow down the test runs much

testsuite/tests/ghc-regress/indexed-types/should_compile/all.T

 setTestOpts(only_compiler_types(['ghc']))
-setTestOpts(omit_ways(['optc', 'optasm', 'hpc']))
+# Keep optimised tests, so we test coercion optimisation
+setTestOpts(omit_ways(['optasm', 'hpc']))
 
 test('Simple1', normal, compile, [''])
 test('Simple2', normal, compile, [''])