Add testing tool to lie to the DFG about profiles

Add testing tool to lie to the DFG about profiles
https://bugs.webkit.org/show_bug.cgi?id=175487

Reviewed by Saam Barati.

JSTests:

* stress/compare-eq-incomplete-profile.js: Added.
(const.test.createBuiltin):

Source/JavaScriptCore:

This patch adds a new bytecode identity_with_profile that lets
us lie to the DFG about what profiles it has seen as the input to
another bytecode. Previously, there was no reliable way to force
a given profile when we tired up.

* bytecode/BytecodeDumper.cpp:
(JSC::BytecodeDumper<Block>::dumpBytecode):
* bytecode/BytecodeIntrinsicRegistry.h:
* bytecode/BytecodeList.json:
* bytecode/BytecodeUseDef.h:
(JSC::computeUsesForBytecodeOffset):
(JSC::computeDefsForBytecodeOffset):
* bytecode/SpeculatedType.cpp:
(JSC::speculationFromString):
* bytecode/SpeculatedType.h:
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::emitIdWithProfile):
* bytecompiler/BytecodeGenerator.h:
* bytecompiler/NodesCodegen.cpp:
(JSC::BytecodeIntrinsicNode::emit_intrinsic_idWithProfile):
* dfg/DFGAbstractInterpreterInlines.h:
(JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
* dfg/DFGByteCodeParser.cpp:
(JSC::DFG::ByteCodeParser::parseBlock):
* dfg/DFGCapabilities.cpp:
(JSC::DFG::capabilityLevel):
* dfg/DFGClobberize.h:
(JSC::DFG::clobberize):
* dfg/DFGDoesGC.cpp:
(JSC::DFG::doesGC):
* dfg/DFGFixupPhase.cpp:
(JSC::DFG::FixupPhase::fixupNode):
* dfg/DFGMayExit.cpp:
* dfg/DFGNode.h:
(JSC::DFG::Node::getForcedPrediction):
* dfg/DFGNodeType.h:
* dfg/DFGPredictionPropagationPhase.cpp:
* dfg/DFGSafeToExecute.h:
(JSC::DFG::safeToExecute):
* dfg/DFGSpeculativeJIT32_64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGSpeculativeJIT64.cpp:
(JSC::DFG::SpeculativeJIT::compile):
* dfg/DFGValidate.cpp:
* jit/JIT.cpp:
(JSC::JIT::privateCompileMainPass):
* jit/JIT.h:
* jit/JITOpcodes.cpp:
(JSC::JIT::emit_op_identity_with_profile):
* jit/JITOpcodes32_64.cpp:
(JSC::JIT::emit_op_identity_with_profile):
* llint/LowLevelInterpreter.asm:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220735 268f45cc-cd09-0410-ab3c-d52691b4dbfc