Remove unused labels from ARM ABI test assembly.

I think these were copied over from the x86_64 one on accident.

Change-Id: I0a8bb28bb0b9e94739f4696146e2418e84cb2b87
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/39007
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/test/asm/trampoline-armv4.pl b/crypto/test/asm/trampoline-armv4.pl
index 6118dd7..4a61f61 100755
--- a/crypto/test/asm/trampoline-armv4.pl
+++ b/crypto/test/asm/trampoline-armv4.pl
@@ -64,7 +64,6 @@
 .globl	abi_test_trampoline
 .align	4
 abi_test_trampoline:
-.Labi_test_trampoline_begin:
 	@ Save parameters and all callee-saved registers. For convenience, we
 	@ save r9 on iOS even though it's volatile.
 	vstmdb	sp!, {d8-d15}
diff --git a/crypto/test/asm/trampoline-armv8.pl b/crypto/test/asm/trampoline-armv8.pl
index 410b59e..aefe5f7 100755
--- a/crypto/test/asm/trampoline-armv8.pl
+++ b/crypto/test/asm/trampoline-armv8.pl
@@ -57,7 +57,6 @@
 .globl	abi_test_trampoline
 .align	4
 abi_test_trampoline:
-.Labi_test_trampoline_begin:
 	// Stack layout (low to high addresses)
 	//   x29,x30 (16 bytes)
 	//    d8-d15 (64 bytes)