cbfdbee

Refactor jitMemcpy into atomic and non-atomic versions
https://bugs.webkit.org/show_bug.cgi?id=293649

Reviewed by NOBODY (OOPS!).

On ARMv7, there are some concurrent repatching issues because of
unaligned writes to the jit region. Instead of repatching whenever it
is easy, we should be explicit about when we expect writes to the jit
region to tear or not.

We also add a new option to test this that forces tears in the non-atomic
version.

Finally, we increase the alignment on armv7 for patchable jumps.

* Source/JavaScriptCore/assembler/ARM64Assembler.h:
* Source/JavaScriptCore/assembler/ARMv7Assembler.h:
(JSC::ARMv7Assembler::revertJumpTo_movT3movtcmpT2):
(JSC::ARMv7Assembler::revertJumpTo_movT3):
(JSC::ARMv7Assembler::linkPointer):
(JSC::ARMv7Assembler::relinkCall):
(JSC::ARMv7Assembler::repatchPointer):
(JSC::ARMv7Assembler::patchableJumpSize):
(JSC::ARMv7Assembler::setInt32):
(JSC::ARMv7Assembler::setUInt7ForLoad):
(JSC::ARMv7Assembler::setPointerAtomic):
(JSC::ARMv7Assembler::setPointer):
* Source/JavaScriptCore/assembler/AbstractMacroAssembler.h:
(JSC::AbstractMacroAssembler::padBeforePatch):
* Source/JavaScriptCore/assembler/AssemblerCommon.h:
(JSC::memcpyAtomic):
(JSC::memcpyNonAtomic):
(JSC::machineCodeCopy):
(JSC::memcpyAtomicIfPossible): Deleted.
* Source/JavaScriptCore/assembler/MacroAssemblerARM64.h:
(JSC::MacroAssemblerARM64::reemitInitialMoveWithPatch):
* Source/JavaScriptCore/assembler/MacroAssemblerARMv7.h:
(JSC::MacroAssemblerARMv7::threadSafePatchableNearCall):
(JSC::MacroAssemblerARMv7::threadSafePatchableNearTailCall):
* Source/JavaScriptCore/assembler/X86Assembler.h:
(JSC::X86Assembler::replaceWithHlt):
(JSC::X86Assembler::replaceWithJump):
(JSC::X86Assembler::revertJumpTo_movq_i64r):
(JSC::X86Assembler::revertJumpTo_movl_i32r):
(JSC::X86Assembler::revertJumpTo_cmpl_ir_force32):
(JSC::X86Assembler::revertJumpTo_cmpl_im_force32):
(JSC::X86Assembler::setPointer):
(JSC::X86Assembler::setInt32):
(JSC::X86Assembler::setInt8):
* Source/JavaScriptCore/jit/ExecutableAllocator.h:
(JSC::jitMemcpyCheckForZeros):
(JSC::jitMemcpyChecks):
(JSC::performJITMemcpyImpl):
(JSC::performJITMemcpyAtomic):
(JSC::performJITMemcpy):
* Source/JavaScriptCore/runtime/OptionsList.h:

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