https://bugs.webkit.org/show_bug.cgi?id=76855

Reviewed by Oliver Hunt.

To enable the profiler, set the JSC_CODE_PROFILING environment variable to
1 (no tracing the C stack), 2 (trace one level of C code) or 3 (recursively
trace all samples).

The profiler requires -fomit-frame-pointer to be removed from the build flags.

* JavaScriptCore.exp:
    - Removed an export.
* JavaScriptCore.xcodeproj/project.pbxproj:
    - Added new files
* bytecode/CodeBlock.cpp:
    - For baseline codeblocks, cache the result of canCompileWithDFG.
* bytecode/CodeBlock.h:
    - For baseline codeblocks, cache the result of canCompileWithDFG.
* jit/ExecutableAllocator.cpp:
(JSC::ExecutableAllocator::initializeAllocator):
    - Notify the profiler when the allocator is created.
(JSC::ExecutableAllocator::allocate):
    - Inform the allocated of the ownerUID.
* jit/ExecutableAllocatorFixedVMPool.cpp:
(JSC::ExecutableAllocator::initializeAllocator):
    - Notify the profiler when...