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patch 8.2.2549: crash after using "g:" in a for loop

Commit: https://github.com/vim/vim/commit/1bd3cb201983859d86d644eef9e98cd3e9de7261
Author: Bram Moolenaar <Bram@vim.org>
Date: Wed Feb 24 12:27:31 2021 +0100

patch 8.2.2549: crash after using "g:" in a for loop

Problem: Crash after using "g:" in a for loop.
Solution: Increment the reference count. (closes https://github.com/vim/vim/issues/7892)

diff -r a18e4d113a10 -r e45b2e28e45e src/testdir/test_vim9_expr.vim

--- a/src/testdir/test_vim9_expr.vim Tue Feb 23 19:45:05 2021 +0100

+++ b/src/testdir/test_vim9_expr.vim Wed Feb 24 12:30:03 2021 +0100

		@@ -2545,6 +2545,12 @@
2545	2545	assert_equal('some', get(t:, 'some_var', 'xxx'))
2546	2546	assert_equal('xxx', get(t:, 'no_var', 'xxx'))
2547	2547	unlet t:some_var
	2548	+
	2549	+ # check using g: in a for loop more than DO_NOT_FREE_CNT times
	2550	+ for i in range(100000)
	2551	+ if has_key(g:, 'does-not-exist')
	2552	+ endif
	2553	+ endfor
2548	2554	enddef
2549	2555
2550	2556	def Test_expr7_parens()

diff -r a18e4d113a10 -r e45b2e28e45e src/version.c

--- a/src/version.c Tue Feb 23 19:45:05 2021 +0100

+++ b/src/version.c Wed Feb 24 12:30:03 2021 +0100

		@@ -751,6 +751,8 @@
751	751	static int included_patches[] =
752	752	{ /* Add new patch number below this line */
753	753	/**/
	754	+ 2549,
	755	+/**/
754	756	2548,
755	757	/**/
756	758	2547,

diff -r a18e4d113a10 -r e45b2e28e45e src/vim9execute.c

--- a/src/vim9execute.c Tue Feb 23 19:45:05 2021 +0100

+++ b/src/vim9execute.c Wed Feb 24 12:30:03 2021 +0100