Remove test compiler test for unsupported sshl

Previously, the Power codegen did not support the sshl opcode. For some
reason, one of the test compiler tests was thus asserting that this
opcode should cause a compilation failure. As the sshl opcode is now
supported, this test has been removed.

Signed-off-by: Ben Thomas <ben@benthomas.ca>

fvtest/compilertest/tests/PPCOpCodesTest.cpp

@@ -576,8 +576,6 @@ PPCOpCodesTest::UnsupportedOpCodesTests()
    addUnsupportedOpCodeTest(_numberOfBinaryArgs, TR::sdiv, "sDiv", _argTypesBinaryShort, TR::Int16);
    addUnsupportedOpCodeTest(_numberOfBinaryArgs, TR::srem, "sRem", _argTypesBinaryShort, TR::Int16);
 
-   addUnsupportedOpCodeTest(_numberOfBinaryArgs, TR::sshl, "sShl", _argTypesBinaryShort, TR::Int16);
-
    addUnsupportedOpCodeTest(_numberOfBinaryArgs, TR::bucmplt, "bucmplt", _argTypesBinaryByte, TR::Int32);
    addUnsupportedOpCodeTest(_numberOfBinaryArgs, TR::bucmpge, "bucmpge", _argTypesBinaryByte, TR::Int32);
    addUnsupportedOpCodeTest(_numberOfBinaryArgs, TR::bucmpgt, "bucmpgt", _argTypesBinaryByte, TR::Int32);