APP CRASH Qt 5.6 QMainWindow application built with VS2015

Xref #1589 which is about a QLabel app.

Building a full QMainWindow app with Qt 5.6 RC with VS2015 on Win10 runs under DR but not Dr. Memory:

The app is the sample at Qt/Qt5.6.0/Examples/Qt-5.6/qtbase/widgets/mainwindows/application/

Natively it runs fine:

```
% PATH=~/extsw/Qt/Qt5.6.0/5.6/msvc2015/bin:$PATH build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe
```

It runs fine under plain DR:

```
% PATH=~/extsw/Qt/Qt5.6.0/5.6/msvc2015/bin:$PATH ~/DrMemory-Windows-1.10.0-2/dynamorio/bin32/drrun -- build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe
```

It crashes under DrM, full or light:

```
% PATH=~/extsw/Qt/Qt5.6.0/5.6/msvc2015/bin:$PATH ~/DrMemory-Windows-1.10.0-2/bin/drmemory -light -batch -- build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe
~~Dr.M~~ Dr. Memory version 1.10.0
~~Dr.M~~ Running "build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe"
~~Dr.M~~
~~Dr.M~~ Error #1: INVALID HEAP ARGUMENT to realloc 0x00790628
~~Dr.M~~ # 0 replace_realloc [d:\drmemory_package\common\alloc_replace.c:2668]
~~Dr.M~~ # 1 Qt5Cored.dll!QListData::realloc_grow [c:\users\qt\work\qt\qtbase\src\corelib\tools\qlist.cpp:156]
~~Dr.M~~ # 2 Qt5Cored.dll!QListData::append [c:\users\qt\work\qt\qtbase\src\corelib\tools\qlist.cpp:182]
~~Dr.M~~ # 3 Qt5Cored.dll!QListData::append [c:\users\qt\work\qt\qtbase\src\corelib\tools\qlist.cpp:192]
~~Dr.M~~ # 4 Qt5Cored.dll!QList<>::append [c:\users\qt\work\qt\qtbase\src\corelib\tools\qlist.h:592]
~~Dr.M~~ # 5 Qt5Cored.dll!qRegisterResourceData [c:\users\qt\work\qt\qtbase\src\corelib\io\qresource.cpp:838]
~~Dr.M~~ # 6 qwindowsd.dll!qInitResources_cursors [c:\users\qt\work\qt\qtbase\src\plugins\platforms\windows\.rcc\debug\qrc_cursors.cpp:754]
~~Dr.M~~ # 7 qwindowsd.dll!`anonymous namespace'::initializer::initializer [c:\users\qt\work\qt\qtbase\src\plugins\platforms\windows\.rcc\debug\qrc_cursors.cpp:768]
~~Dr.M~~ # 8 qwindowsd.dll!`anonymous namespace'::`dynamic initializer for 'dummy'' [c:\users\qt\work\qt\qtbase\src\plugins\platforms\windows\.rcc\debug\qrc_cursors.cpp:770]
~~Dr.M~~ # 9 ucrtbased.dll!initterm +0x48 (0x5e087dd9 )
~~Dr.M~~ #10 qwindowsd.dll!dllmain_crt_process_attach [f:\dd\vctools\crt\vcstartup\src\startup\dll_dllmain.cpp:65]
~~Dr.M~~ #11 qwindowsd.dll!dllmain_crt_dispatch [f:\dd\vctools\crt\vcstartup\src\startup\dll_dllmain.cpp:133]
~~Dr.M~~ #12 qwindowsd.dll!dllmain_dispatch [f:\dd\vctools\crt\vcstartup\src\startup\dll_dllmain.cpp:182]
~~Dr.M~~ #13 qwindowsd.dll!_DllMainCRTStartup [f:\dd\vctools\crt\vcstartup\src\startup\dll_dllmain.cpp:250]
~~Dr.M~~ #14 ntdll.dll!RtlDecompressBuffer +0xdd (0x77486b8e )
~~Dr.M~~ #15 ntdll.dll!RtlAnsiCharToUnicodeChar +0x4dd (0x77455ade )
~~Dr.M~~ #16 ntdll.dll!LdrShutdownProcess +0x398 (0x77468189 )
~~Dr.M~~ #17 ntdll.dll!LdrShutdownProcess +0x258 (0x77468049 )
~~Dr.M~~ #18 ntdll.dll!EtwEventUnregister +0x40f (0x77442240 )
~~Dr.M~~ #19 ntdll.dll!RtlAddAccessAllowedAce +0x68e (0x7745e33f )
~~Dr.M~~ Note: @0:00:03.969 in thread 2968
~~Dr.M~~
~~Dr.M~~ Error #2: UNADDRESSABLE ACCESS: reading 0x00000000-0x00000004 4 byte(s)
~~Dr.M~~ # 0 Qt5Guid.dll!QGuiApplicationPrivate::createEventDispatcher [c:\users\qt\work\qt\qtbase\src\gui\kernel\qguiapplication.cpp:1244]
~~Dr.M~~ # 1 Qt5Widgetsd.dll!QApplicationPrivate::createEventDispatcher [c:\users\qt\work\qt\qtbase\src\widgets\kernel\qapplication.cpp:196]
~~Dr.M~~ # 2 Qt5Cored.dll!QCoreApplication::init [c:\users\qt\work\qt\qtbase\src\corelib\kernel\qcoreapplication.cpp:814]
~~Dr.M~~ # 3 Qt5Cored.dll!QCoreApplication::QCoreApplication [c:\users\qt\work\qt\qtbase\src\corelib\kernel\qcoreapplication.cpp:705]
~~Dr.M~~ # 4 Qt5Guid.dll!QGuiApplication::QGuiApplication [c:\users\qt\work\qt\qtbase\src\gui\kernel\qguiapplication.cpp:577]
~~Dr.M~~ # 5 Qt5Widgetsd.dll!QApplication::QApplication [c:\users\qt\work\qt\qtbase\src\widgets\kernel\qapplication.cpp:563]
~~Dr.M~~ # 6 main [c:\derek\test\qtdemoapp\main.cpp:52]
~~Dr.M~~ Note: @0:00:05.938 in thread 2968
~~Dr.M~~ Note: instruction: mov (%edx) -> %eax
~~Dr.M~~
~~Dr.M~~ ERRORS FOUND:
~~Dr.M~~ 1 unique, 1 total unaddressable access(es)
~~Dr.M~~ 1 unique, 1 total invalid heap argument(s)
~~Dr.M~~ 0 unique, 0 total GDI usage error(s)
~~Dr.M~~ 0 unique, 0 total warning(s)
~~Dr.M~~ ERRORS IGNORED:
~~Dr.M~~ 4 potential error(s) (suspected false positives)
~~Dr.M~~ (details: C:\derek\DrMemory-Windows-1.10.0-2\drmemory\logs\DrMemory-application.exe.308.000\potential_errors.txt)
~~Dr.M~~ Details: C:\derek\DrMemory-Windows-1.10.0-2\drmemory\logs\DrMemory-application.exe.308.000\results.txt
~~Dr.M~~ WARNING: application exited with abnormal code 0xc0000005
Segmentation fault
```

Debug:

```
% PATH=~/extsw/Qt/Qt5.6.0/5.6/msvc2015/bin:$PATH ~/DrMemory-Windows-1.10.0-2/bin/drmemory -debug -dr_debug -light -batch -- build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe

~~Dr.M~~ Dr. Memory version 1.10.0
~~Dr.M~~ Running "build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe"

~~Dr.M~~ ASSERT FAILURE (thread 1204): d:\drmemory_package\common\alloc_replace.c:949: !info->pre_us || pre_us_base != NULL (need base for pre-us!)~~Dr.M~~ WARNING: application exited with abnormal code 0xffffffff
```

Disabling most features does run:

```
% PATH=~/extsw/Qt/Qt5.6.0/5.6/msvc2015/bin:$PATH ~/DrMemory-Windows-1.10.0-2/bin/drmemory -leaks_only -no_count_leaks -no_track_allocs -batch -- build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe
~~Dr.M~~ Dr. Memory version 1.10.0
~~Dr.M~~ Running "build-application-Desktop_Qt_5_6_0_MSVC2015_32bit-Debug/debug/application.exe"
~~Dr.M~~
~~Dr.M~~ NO ERRORS FOUND:
~~Dr.M~~ 0 unique, 0 total warning(s)
~~Dr.M~~ ERRORS IGNORED:
~~Dr.M~~ Details: C:\derek\DrMemory-Windows-1.10.0-2\drmemory\logs\DrMemory-application.exe.3088.000\results.txt
```