[dart2wasm] co19/Language/Functions/element_type_A03_t02 crashes the compiler

[sgrekhov]

Test https://github.com/dart-lang/co19/blob/master/Language/Functions/element_type_A03_t02.dart craches dart2wasm
Log

/=======================================================================================\
| co19/Language/Functions/element_type_A03_t02 is new and failed (Crash, expected Pass) |
\=======================================================================================/

--- Command "dart2wasm" (took 671ms):
DART_CONFIGURATION=ReleaseX64 CHROME_PATH=/b/s/w/ir/third_party/browsers/chrome/chrome/google-chrome sdk/bin/dart2wasm_developer -Dtest_runner.configuration=dart2wasm-linux-chrome /b/s/w/ir/tests/co19/src/Language/Functions/element_type_A03_t02.dart /b/s/w/ir/out/ReleaseX64/generated_tests/dart2wasm-linux-chrome/tests_co19_src_Language_Functions_element_type_A03_t02/element_type_A03_t02.wasm

exit code:
255

stderr:
Unhandled exception:
Crash when compiling:
Bad state: No element

#0      List.single (dart:core-patch/growable_array.dart:353)
#1      _WasmTransformer._lowerAsyncStar (package:dart2wasm/transformers.dart:607)
#2      _WasmTransformer.visitFunctionNode (package:dart2wasm/transformers.dart:694)
#3      FunctionNode.accept (package:kernel/ast.dart:3721)
#4      Transformer.transform (package:kernel/visitor.dart:1773)
#5      Procedure.transformChildren (package:kernel/ast.dart:3143)
#6      Transformer.defaultTreeNode (package:kernel/visitor.dart:1807)
#7      TreeVisitor.defaultMember (package:kernel/visitor.dart:471)
#8      _WasmTransformer.defaultMember (package:dart2wasm/transformers.dart:69)
#9      TreeVisitor.visitProcedure (package:kernel/visitor.dart:475)
#10     Procedure.accept (package:kernel/ast.dart:3124)
#11     Transformer.transform (package:kernel/visitor.dart:1773)
#12     Transformer.transformList (package:kernel/visitor.dart:1790)
#13     Library.transformChildren (package:kernel/ast.dart:608)
#14     Transformer.defaultTreeNode (package:kernel/visitor.dart:1807)
#15     TreeVisitor.visitLibrary (package:kernel/visitor.dart:504)
#16     List.forEach (dart:core-patch/growable_array.dart)
#17     transformLibraries (package:dart2wasm/transformers.dart:18)
#18     WasmTarget.performModularTransformationsOnLibraries (package:dart2wasm/target.dart:267)
#19     KernelTarget.runBuildTransformations (package:front_end/src/fasta/kernel/kernel_target.dart:1559)
#20     KernelTarget.buildComponent.<anonymous closure> (package:front_end/src/fasta/kernel/kernel_target.dart:626)
<asynchronous suspension>
#21     withCrashReporting (package:front_end/src/fasta/crash.dart:133)
<asynchronous suspension>
#22     KernelTarget.buildComponent (package:front_end/src/fasta/kernel/kernel_target.dart:576)
<asynchronous suspension>
#23     _buildInternal (package:front_end/src/kernel_generator_impl.dart:210)
<asynchronous suspension>
#24     withCrashReporting (package:front_end/src/fasta/crash.dart:133)
<asynchronous suspension>
#25     kernelForProgramInternal.<anonymous closure> (package:front_end/src/api_prototype/kernel_generator.dart:62)
<asynchronous suspension>
#26     CompilerContext.clear (package:front_end/src/fasta/compiler_context.dart:139)
<asynchronous suspension>
#27     kernelForProgramInternal (package:front_end/src/api_prototype/kernel_generator.dart:61)
<asynchronous suspension>
#28     kernelForProgram (package:front_end/src/api_prototype/kernel_generator.dart:50)
<asynchronous suspension>
#29     compileToModule (package:dart2wasm/compile.dart:104)
<asynchronous suspension>
#30     main (package:dart2wasm/dart2wasm.dart:134)
<asynchronous suspension>
#31     main (file:///b/s/w/ir/cache/builder/sdk/pkg/dart2wasm/bin/dart2wasm.dart:7)
<asynchronous suspension>

--- Re-run this test:
python3 tools/test.py -n dart2wasm-linux-chrome co19/Language/Functions/element_type_A03_t02