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diff -up firefox-70.0/layout/base/PresShell.h.1354671 firefox-70.0/layout/base/PresShell.h
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--- firefox-70.0/layout/base/PresShell.h.1354671	2019-10-22 12:33:12.987775587 +0200
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+++ firefox-70.0/layout/base/PresShell.h	2019-10-22 12:36:39.999366086 +0200
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@@ -257,7 +257,7 @@ class PresShell final : public nsStubDoc
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    * to the same aSize value.  AllocateFrame is infallible and will abort
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    * on out-of-memory.
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    */
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-  void* AllocateFrame(nsQueryFrame::FrameIID aID, size_t aSize) {
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+  void* __attribute__((optimize("no-lifetime-dse"))) AllocateFrame(nsQueryFrame::FrameIID aID, size_t aSize) {
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 #define FRAME_ID(classname, ...)                                  \
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   static_assert(size_t(nsQueryFrame::FrameIID::classname##_id) == \
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                     size_t(eArenaObjectID_##classname),           \