Add -YemitTasty pos test

Author: nicolasstucki

compiler/test/dotty/tools/dotc/CompilationTests.scala

@@ -96,6 +96,7 @@ class CompilationTests extends ParallelTesting {
     compileFilesInDir("../tests/pos-scala2", scala2Mode) +
     compileFilesInDir("../tests/pos", defaultOptions) +
     compileFilesInDir("../tests/pos-deep-subtype", allowDeepSubtypes) +
+    compileDir("../tests/pos/i1137-1", defaultOptions and "-YemitTasty") +
     compileFile(
       // succeeds despite -Xfatal-warnings because of -nowarn
       "../tests/neg/customArgs/xfatalWarnings.scala",