Revert "gcov: clang: fix clang-11+ build"

This reverts commit 04c53de57cb6435738961dace8b1b71d3ecd3c39.

Nathan Chancellor points out that it should not have been merged into
mainline by itself. It was a fix for "gcov: use kvmalloc()", which is
still in -mm/-next. Merging it alone has broken the build.

Link: https://github.com/ClangBuiltLinux/continuous-integration2/runs/2384465683?check_suite_focus=true
Reported-by: Nathan Chancellor <[e-mail]>
Cc: Johannes Berg <[e-mail]>
Cc: Nick Desaulniers <[e-mail]>
Cc: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

kernel/gcov/clang.c

···
 	INIT_LIST_HEAD(&fn_dup->head);
 
 	cv_size = fn->num_counters * sizeof(fn->counters[0]);
-	fn_dup->counters = kvmalloc(cv_size, GFP_KERNEL);
+	fn_dup->counters = vmalloc(cv_size);
 	if (!fn_dup->counters) {
 		kfree(fn_dup);
 		return NULL;