Use unified syntax to compile with both llvm and gcc.

All arch-arm and arch-arm64 .S files were compiled
by gcc with and without this patch. The output object files
were identical. When compiled with llvm and this patch,
the output files were also identical to gcc's output.

BUG: 18061004
Change-Id: I458914d512ddf5496e4eb3d288bf032cd526d32b
diff --git a/libc/arch-arm64/generic/bionic/strchr.S b/libc/arch-arm64/generic/bionic/strchr.S
index 469b83c..b54106d 100644
--- a/libc/arch-arm64/generic/bionic/strchr.S
+++ b/libc/arch-arm64/generic/bionic/strchr.S
@@ -109,7 +109,7 @@
 	addp	vend1.16b, vend1.16b, vend2.16b		// 128->64
 	lsr	tmp1, tmp3, tmp1
 
-	mov	tmp3, vend1.2d[0]
+	mov	tmp3, vend1.d[0]
 	bic	tmp1, tmp3, tmp1	// Mask padding bits.
 	cbnz	tmp1, .Ltail
 
@@ -124,7 +124,7 @@
 	orr	vend2.16b, vhas_nul2.16b, vhas_chr2.16b
 	orr	vend1.16b, vend1.16b, vend2.16b
 	addp	vend1.2d, vend1.2d, vend1.2d
-	mov	tmp1, vend1.2d[0]
+	mov	tmp1, vend1.d[0]
 	cbz	tmp1, .Lloop
 
 	/* Termination condition found.  Now need to establish exactly why
@@ -138,7 +138,7 @@
 	addp	vend1.16b, vend1.16b, vend2.16b		// 256->128
 	addp	vend1.16b, vend1.16b, vend2.16b		// 128->64
 
-	mov	tmp1, vend1.2d[0]
+	mov	tmp1, vend1.d[0]
 .Ltail:
 	/* Count the trailing zeros, by bit reversing...  */
 	rbit	tmp1, tmp1