LTO: Restore the wrapper symbol check for standard function

Call unwrap_hash_lookup to restore the wrapper symbol check for standard
function since reference to standard function may not show up in LTO
symbol table:

[hjl@gnu-tgl-3 pr31956-3]$ nm foo.o
00000000 T main
         U __real_malloc
00000000 T __wrap_malloc
[hjl@gnu-tgl-3 pr31956-3]$  lto-dump -list foo.o
Type   Visibility  Size  Name
function  default     0  malloc
function  default     0  __real_malloc
function  default     3  main
function  default     5  __wrap_malloc
[hjl@gnu-tgl-3 pr31956-3]$ make
gcc -O2 -flto -Wall   -c -o foo.o foo.c
gcc -Wl,--wrap=malloc -O2 -flto -Wall -o x foo.o
/usr/local/bin/ld: /tmp/ccsPW0a9.ltrans0.ltrans.o: in function `main':
<artificial>:(.text.startup+0xa): undefined reference to `__wrap_malloc'
collect2: error: ld returned 1 exit status
make: *** [Makefile:22: x] Error 1
[hjl@gnu-tgl-3 pr31956-3]$

Also add a test to verify that the unused wrapper is removed.

	PR ld/31956
	* plugin.c (get_symbols): Restore the wrapper symbol check for
	standard function.
	* testsuite/ld-plugin/lto.exp: Run the malloc test and the
	unused test.
	* testsuite/ld-plugin/pr31956c.c: New file.
	* testsuite/ld-plugin/pr31956d.c: New file.
	* testsuite/ld-plugin/pr31956d.d: New file.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>

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