Update x86 nacl tests for section alignment change

	* ld-i386/tlsbindesc-nacl.rd: Updated for text/data/bss section
	alignment change.
	* ld-x86-64/split-by-file-nacl.rd: Likewise.
ld/testsuite/
	* ld-size/size.exp: For *-*-nacl* targets, use options_regsub(ld)
	to massage -m arguments into _nacl variants.
	* ld/testsuite/ld-size/size32-1-i386.d: Loosen regexps so they
	don't care what the exact addresses are.
	* ld/testsuite/ld-size/size32-1-x32.d: Likewise.
	* ld/testsuite/ld-size/size32-1-x86-64.d: Likewise.
	* ld/testsuite/ld-size/size32-2-i386.d: Likewise.
	* ld/testsuite/ld-size/size32-2-x32.d: Likewise.
	* ld/testsuite/ld-size/size32-2-x86-64.d: Likewise.
	* ld/testsuite/ld-size/size64-1-x32.d: Likewise.
	* ld/testsuite/ld-size/size64-1-x86-64.d: Likewise.
	* ld/testsuite/ld-size/size64-2-x32.d: Likewise.
	* ld/testsuite/ld-size/size64-2-x86-64.d: Likewise.