[PATCH]use vnode->get_constructor () to get intial in lto[PR94822]

[lizekun (A)]

Hi,

This ICE appears because gcc will stream it to the function_body section when 
processing the 
variable with the initial value of the constructor type, and the 
error_mark_node to the 
decls section. When recompiling, the value obtained with DECL_INITIAL will be 
error_mark.

This patch use vnode->get_constructor () to get intial in lto.

Bootstrap and tested on aarch64 Linux platform. 


Best regulars,
Zekun


gcc:
+2020-04-29  Li Zekun  <lizek...@huawei.com>
+
+       PR  lto/94822
+       * tree.c: use vnode->get_constructor () to get intial in lto

gcc/testsuite:
+2020-04-29  Li Zekun  <lizek...@huawei.com>
+
+       PR  lto/94822
+       * gcc.dg/lto/pr94822.h: New test.
+       * gcc.dg/lto/pr94822_0.c: New test.
+       * gcc.dg/lto/pr94822_1.c: New test.

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