drd: Fix an assertion failure in the internal consistency check code (#332055)

When DRD is built with ENABLE_DRD_CONSISTENCY_CHECKS enabled it fails with an assert on platforms where VG_STACK_REDZONE_SZB is #define'd as 0 (for example on 32-bit x86). drd: drd_thread.h:299 (vgDrd_thread_set_stack_min): Assertion 'DRD_(g_threadinfo)[tid].stack_min < DRD_(g_threadinfo)[tid].stack_max || DRD_(g_threadinfo)[tid].stack_max == 0' failed. ==12392== at 0x380227CD: report_and_quit (m_libcassert.c:279) ==12392== by 0x38022979: vgPlain_assert_fail (m_libcassert.c:359) ==12392== by 0x38015B29: drd_post_thread_create (drd_thread.h:297) ==12392== by 0x380A5DDC: run_a_thread_NORETURN (syswrap-linux.c) This is because on drd_post_thread_create() call is made to: drd_start_using_mem_stack2(drd_created, stack_max, 0); and in drd_start_using_mem_stack2() calls is made to: DRD_(thread_set_stack_min)(tid, a - VG_STACK_REDZONE_SZB); For many platforms VG_STACK_REDZONE_SZB is #define'd as 0 so that stack_min == stack_max in DRD_(thread_set_stack_min)(). I think it is safe to change the assert from (stack_min < stack_max) to (stack_min <= stack_max).

From: Ivo Raisr <ivosh@ivosh.net>


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13870 a5019735-40e9-0310-863c-91ae7b9d1cf9