Merge 10.6 into 10.10

The MDEV-29693 conflict resolution is from Monty, as well as is
a bug fix where ANALYZE TABLE wrongly built histograms for
single-column PRIMARY KEY.
Also includes a fix for safe_malloc error reporting.

Other things:
- Copied main.log_slow from 10.4 to avoid mtr issue

Disabled test:
- spider/bugfix.mdev_27239 because we started to get
  +Error	1429 Unable to connect to foreign data source: localhost
  -Error	1158 Got an error reading communication packets
- main.delayed
  - Bug#54332 Deadlock with two connections doing LOCK TABLE+INSERT DELAYED
    This part is disabled for now as it fails randomly with different
    warnings/errors (no corruption).

configure.cmake

@@ -672,25 +672,11 @@ int main()
 }
 " HAVE_PTHREAD_YIELD_ZERO_ARG)
 
-IF(NOT STACK_DIRECTION)
-  IF(CMAKE_CROSSCOMPILING AND NOT DEFINED CMAKE_CROSSCOMPILING_EMULATOR)
-    MESSAGE(FATAL_ERROR 
-    "STACK_DIRECTION is not defined.  Please specify -DSTACK_DIRECTION=1 "
-    "or -DSTACK_DIRECTION=-1 when calling cmake.")
-  ELSE()
-    TRY_RUN(STACKDIR_RUN_RESULT STACKDIR_COMPILE_RESULT    
-     ${CMAKE_BINARY_DIR} 
-     ${CMAKE_SOURCE_DIR}/cmake/stack_direction.c
-     )
-     # Test program returns 0 (down) or 1 (up).
-     # Convert to -1 or 1
-     IF(STACKDIR_RUN_RESULT EQUAL 0)
-       SET(STACK_DIRECTION -1 CACHE INTERNAL "Stack grows direction")
-     ELSE()
-       SET(STACK_DIRECTION 1 CACHE INTERNAL "Stack grows direction")
-     ENDIF()
-     MESSAGE(STATUS "Checking stack direction : ${STACK_DIRECTION}")
-   ENDIF()
+IF(STACK_DIRECTION)
+ELSEIF(CMAKE_SYSTEM_PROCESSOR MATCHES "^(parisc|hppa)")
+  SET(STACK_DIRECTION 1 CACHE INTERNAL "Stack grows direction")
+ELSE()
+  SET(STACK_DIRECTION -1 CACHE INTERNAL "Stack grows direction")
 ENDIF()
 
 #