tst_qtgraphicaleffects::dropShadow() segfaults on powerpc in QV4::Moth::VME::run

#0  QV4::Moth::VME::run (this=this@entry=0xfffe98ef, engine=engine@entry=0x10080648, code=0xf6cbdbc8 "\017\212~ ", 
    code@entry=0xf6cbd900 "\017\212\177\020", storeJumpTable=storeJumpTable@entry=0x0) at jsruntime/qv4vme_moth.cpp:915
#1  0x0f8aa2b4 in QV4::Moth::VME::exec (engine=0x10080648, code=0xf6cbd900 "\017\212\177\020") at jsruntime/qv4vme_moth.cpp:974
#2  0x0f839314 in QV4::SimpleScriptFunction::call (that=<optimized out>, callData=0xf64108d0) at jsruntime/qv4functionobject.cpp:582
#3  0x0f8c05f0 in QV4::Object::call (d=0xf64108d0, this=0xf6410920) at jsruntime/qv4object_p.h:330
#4  QV4::Runtime::callActivationProperty (engine=engine@entry=0x10080648, nameIndex=<optimized out>, callData=0xf64108d0)
    at jsruntime/qv4runtime.cpp:980
#5  0x0f8a81a0 in QV4::Moth::VME::run (this=this@entry=0xfffe9b9f, engine=engine@entry=0x10080648, code=0xf6cbbff8 "\017\212\224\340", 
    code@entry=0xf6cbbfd0 "\017\212\177\020", storeJumpTable=storeJumpTable@entry=0x0) at jsruntime/qv4vme_moth.cpp:632
#6  0x0f8aa2b4 in QV4::Moth::VME::exec (engine=0x10080648, code=0xf6cbbfd0 "\017\212\177\020") at jsruntime/qv4vme_moth.cpp:974
#7  0x0f839314 in QV4::SimpleScriptFunction::call (that=<optimized out>, callData=0xf6410860) at jsruntime/qv4functionobject.cpp:582
#8  0x0f970a80 in QV4::Object::call (d=0xf6410860, this=0xf6dd0148)
    at ../../include/QtQml/5.7.0/QtQml/private/../../../../../src/qml/jsruntime/qv4object_p.h:330
#9  QQmlJavaScriptExpression::evaluate (this=this@entry=0x100c85c0, callData=callData@entry=0xf6410860, isUndefined=isUndefined@entry=0x0)
    at qml/qqmljavascriptexpression.cpp:196
#10 0x0f8fced0 in QQmlBoundSignalExpression::evaluate (this=0x100c85c0, a=<optimized out>) at qml/qqmlboundsignal.cpp:244
#11 0x0f8fecac in QQmlBoundSignal_callback (e=0x100c74b0, a=0x0) at qml/qqmlboundsignal.cpp:376

        engine->current->lineNumber = instr.lineNumber;

(gdb) p engine
$1 = (QV4::ExecutionEngine *) 0x10080648
(gdb) p engine->current
$2 = (QV4::Heap::ExecutionContext *) 0x0