package/webkitgtk: fix aarch64 renderer process crash

package/webkitgtk: fix aarch64 renderer process crash

We need to backport an aarch64 patch to prevent a crash.

Fixes:
==654== Conditional jump or move depends on uninitialised value(s)
==654==    at 0x68CF9D0: contains (Range.h:115)
==654==    by 0x68CF9D0: mark (JITStubRoutineSet.h:57)
==654==    by 0x68CF9D0: mark (ConservativeRoots.cpp:127)
==654==    by 0x68CF9D0: genericAddPointer<JSC::CompositeMarkHook> (ConservativeRoots.cpp:69)
==654==    by 0x68CF9D0: genericAddSpan<JSC::CompositeMarkHook> (ConservativeRoots.cpp:101)
==654==    by 0x68CF9D0: JSC::ConservativeRoots::add(void*, void*, JSC::JITStubRoutineSet&, JSC::CodeBlockSet&) (ConservativeRoots.cpp:147)
==654==    by 0x68EA5BB: JSC::MachineThreads::gatherConservativeRoots(JSC::ConservativeRoots&, JSC::JITStubRoutineSet&, JSC::CodeBlockSet&, JSC::CurrentThreadState*, WTF::Thread*) (MachineStackMarker.cpp:202)
==654==    by 0x68D885B: _ZZN3JSC4Heap18addCoreConstraintsEvENUlRT_E0_clINS_11SlotVisitorEEEDaS2_ (Heap.cpp:2740)
==654==    by 0x68EFF7B: JSC::MarkingConstraint::execute(JSC::SlotVisitor&) (MarkingConstraint.cpp:58)
==654==    by 0x68F3D83: JSC::MarkingConstraintSolver::runExecutionThread(JSC::SlotVisitor&, JSC::MarkingConstraintSolver::SchedulerPreference, WTF::ScopedLambda<WTF::Optional<unsigned int> ()>) (MarkingConstraintSolver.cpp:237)
==654==    by 0x68D4413: JSC::Heap::runTaskInParallel(WTF::RefPtr<WTF::SharedTask<void (JSC::SlotVisitor&)>, WTF::RawPtrTraits<WTF::SharedTask<void (JSC::SlotVisitor&)> >, WTF::DefaultRefDerefTraits<WTF::SharedTask<void (JSC::SlotVisitor&)> > >) (Heap.cpp:3061)
==654==    by 0x68F3E9F: runFunctionInParallel<JSC::MarkingConstraintSolver::execute(JSC::MarkingConstraintSolver::SchedulerPreference, WTF::ScopedLambda<WTF::Optional<unsigned int>()>)::<lambda(JSC::SlotVisitor&)> > (Heap.h:397)
==654==    by 0x68F3E9F: JSC::MarkingConstraintSolver::execute(JSC::MarkingConstraintSolver::SchedulerPreference, WTF::ScopedLambda<WTF::Optional<unsigned int> ()>) (MarkingConstraintSolver.cpp:66)
==654==    by 0x68F4033: JSC::MarkingConstraintSolver::drain(WTF::BitVector&) (MarkingConstraintSolver.cpp:97)
==654==    by 0x68F4B2F: JSC::MarkingConstraintSet::executeConvergenceImpl(JSC::SlotVisitor&) (MarkingConstraintSet.cpp:114)
==654==    by 0x68F4C6B: JSC::MarkingConstraintSet::executeConvergence(JSC::SlotVisitor&) (MarkingConstraintSet.cpp:83)
==654==    by 0x68D9BC7: JSC::Heap::runFixpointPhase(JSC::GCConductor) (Heap.cpp:1378)
==654==    by 0x68D9E93: runCurrentPhase (Heap.cpp:1208)
==654==    by 0x68D9E93: JSC::Heap::runCurrentPhase(JSC::GCConductor, JSC::CurrentThreadState*) (Heap.cpp:1176)
==654==  Uninitialised value was created by a stack allocation
==654==    at 0x5AC3E80: JSC::ARM64Assembler::linkJump(JSC::AssemblerLabel, JSC::AssemblerLabel, JSC::ARM64Assembler::JumpType, JSC::ARM64Assembler::Condition) [clone .isra.0] (ARM64Assembler.h:2556)

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Acked-by: Adrian Perez de Castro <aperez@igalia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>