re PR testsuite/20772 (x86 tests should run on both i?86 and x86_64)

re PR testsuite/20772 (x86 tests should run on both i?86 and x86_64)

        PR testsuite/20772
	* gfortran.dg/promotion.f90, gcc.misc-tests/i386-pf-3dnow-1.c,
	gcc.misc-tests/i386-pf-athlon-1.c,
	gcc.misc-tests/i386-pf-none-1.c, gcc.misc-tests/i386-pf-sse-1.c,
	g++.dg/opt/mmx1.C, g++.dg/other/big-struct.C,
	g++.dg/abi/bitfield3.C, g++.dg/abi/bitfield8.C,
	g++.dg/abi/bitfield9.C, g++.dg/abi/empty7.C, g++.dg/abi/empty9.C,
	g++.dg/abi/layout4.C, g++.dg/abi/thunk1.C, g++.dg/abi/thunk2.C,
	g++.dg/abi/vbase11.C, g++.dg/abi/vthunk2.C, g++.dg/abi/vthunk3.C,
	g++.dg/ext/attrib8.C: Run also on x86_64 compiling 32-bit x86
	programs.

	* g++.dg/opt/reg-stack4.C, g++.dg/eh/simd-1.C, g++.dg/eh/simd-1.C,
	gcc.dg/setjmp-2.c, gcc.dg/short-compare-1.c,
	gcc.dg/short-compare-2.c, gcc.target/i386/asm-1.c: Handle 32-bit
	x86-64 compilation.

	* g++.dg/warn/register-var-1.C, g++.dg/charset/asm2.c: Run also on
	x86_64.

	* gcc.dg/i386-pentium4-not-mull.c: Change option handling to use
	effective-target ilp32.

From-SVN: r100220