poly1305: make data declared in assembly files private

Update golang/go#18673.

Change-Id: I3ba89bab42f17e6fd7005df40c7a853aef1fda37
Reviewed-on: https://go-review.googlesource.com/35259
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>

poly1305/sum_amd64.s

@@ -54,9 +54,9 @@
 	ADCQ  t3, h1;                  \
 	ADCQ  $0, h2
 
-DATA poly1305Mask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
-DATA poly1305Mask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
-GLOBL poly1305Mask<>(SB), RODATA, $16
+DATA ·poly1305Mask<>+0x00(SB)/8, $0x0FFFFFFC0FFFFFFF
+DATA ·poly1305Mask<>+0x08(SB)/8, $0x0FFFFFFC0FFFFFFC
+GLOBL ·poly1305Mask<>(SB), RODATA, $16
 
 // func poly1305(out *[16]byte, m *byte, mlen uint64, key *[32]key)
 TEXT ·poly1305(SB), $0-32
@@ -67,8 +67,8 @@ TEXT ·poly1305(SB), $0-32
 
 	MOVQ 0(AX), R11
 	MOVQ 8(AX), R12
-	ANDQ poly1305Mask<>(SB), R11   // r0
-	ANDQ poly1305Mask<>+8(SB), R12 // r1
+	ANDQ ·poly1305Mask<>(SB), R11   // r0
+	ANDQ ·poly1305Mask<>+8(SB), R12 // r1
 	XORQ R8, R8                    // h0
 	XORQ R9, R9                    // h1
 	XORQ R10, R10                  // h2

poly1305/sum_arm.s

@@ -9,12 +9,12 @@
 // This code was translated into a form compatible with 5a from the public
 // domain source by Andrew Moon: github.com/floodyberry/poly1305-opt/blob/master/app/extensions/poly1305.
 
-DATA poly1305_init_constants_armv6<>+0x00(SB)/4, $0x3ffffff
-DATA poly1305_init_constants_armv6<>+0x04(SB)/4, $0x3ffff03
-DATA poly1305_init_constants_armv6<>+0x08(SB)/4, $0x3ffc0ff
-DATA poly1305_init_constants_armv6<>+0x0c(SB)/4, $0x3f03fff
-DATA poly1305_init_constants_armv6<>+0x10(SB)/4, $0x00fffff
-GLOBL poly1305_init_constants_armv6<>(SB), 8, $20
+DATA ·poly1305_init_constants_armv6<>+0x00(SB)/4, $0x3ffffff
+DATA ·poly1305_init_constants_armv6<>+0x04(SB)/4, $0x3ffff03
+DATA ·poly1305_init_constants_armv6<>+0x08(SB)/4, $0x3ffc0ff
+DATA ·poly1305_init_constants_armv6<>+0x0c(SB)/4, $0x3f03fff
+DATA ·poly1305_init_constants_armv6<>+0x10(SB)/4, $0x00fffff
+GLOBL ·poly1305_init_constants_armv6<>(SB), 8, $20
 
 // Warning: the linker may use R11 to synthesize certain instructions. Please
 // take care and verify that no synthetic instructions use it.
@@ -27,7 +27,7 @@ TEXT poly1305_init_ext_armv6<>(SB), NOSPLIT, $0
 	ADD       $4, R13, R8
 	MOVM.IB   [R4-R7], (R8)
 	MOVM.IA.W (R1), [R2-R5]
-	MOVW      $poly1305_init_constants_armv6<>(SB), R7
+	MOVW      $·poly1305_init_constants_armv6<>(SB), R7
 	MOVW      R2, R8
 	MOVW      R2>>26, R9
 	MOVW      R3>>20, g