Skip dead conditions in eventpipe srcgen

[am11]

An example of before/after diff:

--- artifacts/obj/coreclr/Linux.x64.Debug/vm/eventing/eventpipe/eventpipe/dotnetruntimeprivate.cpp
+++ artifacts/obj/coreclr/Linux.x64.Debug/vm/eventing/eventpipe/eventpipe/dotnetruntimeprivate.cpp

extern "C" ULONG EventPipeWriteEventExecExeEnd(
    LPCGUID ActivityId,
    LPCGUID RelatedActivityId)
{
    if (!EventPipeEventEnabledExecExeEnd())
        return ERROR_SUCCESS;

+     size_t size = 32;
+     BYTE stackBuffer[32];
-    BYTE stackBuffer[32];
    BYTE *buffer = stackBuffer;
    size_t offset = 0;
-    size_t size = 32;
-    bool fixedBuffer = true;
-    bool success = true;


-
-    if (!success)
-    {
-        if (!fixedBuffer)
-            delete[] buffer;
-        return ERROR_WRITE_FAULT;
-    }

    EventPipeAdapter::WriteEvent(EventPipeEventExecExeEnd, (BYTE *)buffer, (unsigned int)offset, ActivityId, RelatedActivityId);
-
-    if (!fixedBuffer)
-        delete[] buffer;

    return ERROR_SUCCESS;
}

This is to cleanup the bulk of warnings from gcc 11 by commenting out

runtime/eng/native/configurecompiler.cmake

Lines 402 to 404 in ef85762

	add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-Wno-mismatched-new-delete>)
	add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-Wno-free-nonheap-object>)
	add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-Wno-placement-new>)

so we can see the real -Werror=mismatched-new-delete in coreclr/vm that is causing #56888 when DOTNET_EnableEventLog is enabled with debug corerun, e.g.

[ 29%] Building CXX object vm/wks/CMakeFiles/cee_wks_core.dir/__/clsload.cpp.o
/runtime/src/coreclr/vm/ceeload.cpp: In member function 'void Module::InitializeDynamicILCrst()':
/runtime/src/coreclr/vm/ceeload.cpp:1442:16: error: 'void operator delete(void*)' called on pointer returned from a mismatched allocation function [-Werror=mismatched-new-delete]
 1442 |         delete pCrst;
      |                ^~~~~
/runtime/src/coreclr/vm/ceeload.cpp:1438:97: note: returned from 'static void* Crst::operator new(size_t)'
 1438 |     Crst * pCrst = new Crst(CrstDynamicIL, CrstFlags(CRST_UNSAFE_ANYMODE | CRST_DEBUGGER_THREAD));
      |                                                                                                 ^

[am11]

cc @josalem, @janvorli

[josalem]

Thanks for this PR @am11!