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diff -up firefox-65.0/layout/base/nsIPresShell.h.1354671 firefox-65.0/layout/base/nsIPresShell.h
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--- firefox-65.0/layout/base/nsIPresShell.h.1354671	2019-01-29 11:50:08.516649643 +0100
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+++ firefox-65.0/layout/base/nsIPresShell.h	2019-01-29 11:51:48.930258629 +0100
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@@ -205,7 +205,7 @@ class nsIPresShell : public nsStubDocume
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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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     void* result = mFrameArena.AllocateByFrameID(aID, aSize);
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     RecordAlloc(result);
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     return result;