[D] Fix failing EH execution test on i386.

Turn off partitioning unless it was explicitly requested, as it doesn't
work with D exception chaining, where personality routines use LSDA to
determine whether two thrown exceptions are in the same context.

The following distills what was failing in the D testsuite.
```
try {
  try {
    fn();  // throws "1"
  }
  finally {
    throw new Exception("2");
  }
}
catch (Exception e) {
  assert(e.msg == "1");
  assert(e.next.msg == "2");
}
```

gcc/d/ChangeLog:

	PR d/87824
	* d-lang.cc (d_post_options): Disable implicit
	-forder-blocks-and-partition.

From-SVN: r267985

2 files changed, 12 insertions, 0 deletions

diff --git a/gcc/d/ChangeLog b/gcc/d/ChangeLog
index 441fed8..fa4ba35 100644
--- a/gcc/d/ChangeLog
+++ b/gcc/d/ChangeLog
@@ -1,5 +1,11 @@
 2019-01-16  Iain Buclaw  <ibuclaw@gdcproject.org>
 
+	PR d/87824
+	* d-lang.cc (d_post_options): Disable implicit
+	-forder-blocks-and-partition.
+
+2019-01-16  Iain Buclaw  <ibuclaw@gdcproject.org>
+
 	* d-codegen.cc (build_typeof_null_value): New function.
 	* d-tree.h (build_typeof_null_value): Declare.
 	* d-convert.cc (convert_expr): Use build_typeof_null_value.
diff --git a/gcc/d/d-lang.cc b/gcc/d/d-lang.cc
index 109bf4b..b53e56e 100644
--- a/gcc/d/d-lang.cc
+++ b/gcc/d/d-lang.cc
@@ -725,6 +725,12 @@ d_post_options (const char ** fn)
 	global.params.useSwitchError = false;
     }
 
+  /* Turn off partitioning unless it was explicitly requested, as it doesn't
+     work with D exception chaining, where EH handler uses LSDA to determine
+     whether two thrown exception are in the same context.  */
+  if (!global_options_set.x_flag_reorder_blocks_and_partition)
+    global_options.x_flag_reorder_blocks_and_partition = 0;
+
   /* Error about use of deprecated features.  */
   if (global.params.useDeprecated == DIAGNOSTICinform
       && global.params.warnings == DIAGNOSTICerror)