Link shared libasan with -z now on Solaris

g++.dg/asan/default-options-1.C FAILs on Solaris/SPARC and x86:

FAIL: g++.dg/asan/default-options-1.C   -O0  execution test
FAIL: g++.dg/asan/default-options-1.C   -O1  execution test
FAIL: g++.dg/asan/default-options-1.C   -O2  execution test
FAIL: g++.dg/asan/default-options-1.C   -O2 -flto  execution test
FAIL: g++.dg/asan/default-options-1.C   -O2 -flto -flto-partition=none  execution test
FAIL: g++.dg/asan/default-options-1.C   -O3 -g  execution test
FAIL: g++.dg/asan/default-options-1.C   -Os  execution test

The failure is always the same:

AddressSanitizer: CHECK failed: asan_rtl.cpp:397 "((!AsanInitIsRunning() && "ASan init calls itself!")) != (0)" (0x0, 0x0) (tid=1)

This happens because libasan makes unportable assumptions about
initialization order that don't hold on Solaris.  The problem has
already been fixed in clang by

	[Driver] Link shared asan runtime lib with -z now on Solaris/x86
	https://reviews.llvm.org/D156325

where it was way more prevalent.

This patch applies the same fix to gcc.

Tested on i386-pc-solaris2.11 (ld and gld) and sparc-sun-solaris2.11.

2024-01-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* config/sol2.h (LIBASAN_EARLY_SPEC): Add -z now unless
	-static-libasan.  Add missing whitespace.